三角学示例

${(\frac{1}{4} \cdot (\cos (\frac{π}{10}) + i \sin (\frac{π}{10})))}^{5}$

解题步骤 1

运用分配律。

${(\frac{1}{4} \cos (\frac{π}{10}) + \frac{1}{4} (i \sin (\frac{π}{10})))}^{5}$

解题步骤 2

组合 $\frac{1}{4}$ 和 $\cos (\frac{π}{10})$ 。

${(\frac{\cos (\frac{π}{10})}{4} + \frac{1}{4} (i \sin (\frac{π}{10})))}^{5}$

解题步骤 3

乘以 $\frac{1}{4} (i \sin (\frac{π}{10}))$ 。

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解题步骤 3.1

组合 $i$ 和 $\frac{1}{4}$ 。

${(\frac{\cos (\frac{π}{10})}{4} + \frac{i}{4} \sin (\frac{π}{10}))}^{5}$

解题步骤 3.2

组合 $\frac{i}{4}$ 和 $\sin (\frac{π}{10})$ 。

${(\frac{\cos (\frac{π}{10})}{4} + \frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 4

使用二项式定理。

${(\frac{\cos (\frac{π}{10})}{4})}^{5} + 5 {(\frac{\cos (\frac{π}{10})}{4})}^{4} \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5

化简项。

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解题步骤 5.1

化简每一项。

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解题步骤 5.1.1

对 $\frac{\cos (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{4^{5}} + 5 {(\frac{\cos (\frac{π}{10})}{4})}^{4} \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.2

对 $4$ 进行 $5$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + 5 {(\frac{\cos (\frac{π}{10})}{4})}^{4} \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.3

对 $\frac{\cos (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + 5 \frac{\cos^{4} (\frac{π}{10})}{4^{4}} \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.4

对 $4$ 进行 $4$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + 5 \frac{\cos^{4} (\frac{π}{10})}{256} \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.5

组合 $5$ 和 $\frac{\cos^{4} (\frac{π}{10})}{256}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10})}{256} \cdot \frac{i \sin (\frac{π}{10})}{4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.6

合并。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) (i \sin (\frac{π}{10}))}{256 \cdot 4} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.7

将 $256$ 乘以 $4$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{3} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.8

对 $\frac{\cos (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 10 \frac{\cos^{3} (\frac{π}{10})}{4^{3}} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.9

对 $4$ 进行 $3$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 10 \frac{\cos^{3} (\frac{π}{10})}{64} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.10

约去 $2$ 的公因数。

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解题步骤 5.1.10.1

从 $10$ 中分解出因数 $2$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 2 (5) \frac{\cos^{3} (\frac{π}{10})}{64} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.10.2

从 $64$ 中分解出因数 $2$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 2 \cdot 5 \frac{\cos^{3} (\frac{π}{10})}{2 \cdot 32} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.10.3

约去公因数。

解题步骤 5.1.10.4

重写表达式。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + 5 \frac{\cos^{3} (\frac{π}{10})}{32} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.11

组合 $5$ 和 $\frac{\cos^{3} (\frac{π}{10})}{32}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{5 \cos^{3} (\frac{π}{10})}{32} {(\frac{i \sin (\frac{π}{10})}{4})}^{2} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.12

使用幂法则 ${(a b)}^{n} = a^{n} b^{n}$ 分解指数。

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解题步骤 5.1.12.1

对 $\frac{i \sin (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{5 \cos^{3} (\frac{π}{10})}{32} \cdot \frac{{(i \sin (\frac{π}{10}))}^{2}}{4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.12.2

对 $i \sin (\frac{π}{10})$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{5 \cos^{3} (\frac{π}{10})}{32} \cdot \frac{i^{2} \sin^{2} (\frac{π}{10})}{4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.13

合并。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{5 \cos^{3} (\frac{π}{10}) (i^{2} \sin^{2} (\frac{π}{10}))}{32 \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.14

化简分子。

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解题步骤 5.1.14.1

将 $i^{2}$ 重写为 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{5 \cos^{3} (\frac{π}{10}) \cdot - 1 \sin^{2} (\frac{π}{10})}{32 \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.14.2

合并指数。

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解题步骤 5.1.14.2.1

提取负因数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- (5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10}))}{32 \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.14.2.2

将 $5$ 乘以 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 (\cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10}))}{32 \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{32 \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15

化简分母。

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解题步骤 5.1.15.1

将 $32$ 重写为 $2^{5}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{5} \cdot 4^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15.2

将 $4$ 重写为 $2^{2}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{5} \cdot {(2^{2})}^{2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15.3

将 ${(2^{2})}^{2}$ 中的指数相乘。

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解题步骤 5.1.15.3.1

运用幂法则并将指数相乘， ${(a^{m})}^{n} = a^{m n}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{5} \cdot 2^{2 \cdot 2}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15.3.2

将 $2$ 乘以 $2$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{5} \cdot 2^{4}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15.4

使用幂法则 $a^{m} a^{n} = a^{m + n}$ 合并指数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{5 + 4}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.15.5

将 $5$ 和 $4$ 相加。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{2^{9}} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.16

对 $2$ 进行 $9$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} + \frac{- 5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.17

将负号移到分数的前面。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 10 {(\frac{\cos (\frac{π}{10})}{4})}^{2} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.18

对 $\frac{\cos (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 10 \frac{\cos^{2} (\frac{π}{10})}{4^{2}} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.19

对 $4$ 进行 $2$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 10 \frac{\cos^{2} (\frac{π}{10})}{16} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.20

约去 $2$ 的公因数。

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解题步骤 5.1.20.1

从 $10$ 中分解出因数 $2$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 2 (5) \frac{\cos^{2} (\frac{π}{10})}{16} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.20.2

从 $16$ 中分解出因数 $2$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 2 \cdot 5 \frac{\cos^{2} (\frac{π}{10})}{2 \cdot 8} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.20.3

约去公因数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 2 \cdot 5 \frac{\cos^{2} (\frac{π}{10})}{2 \cdot 8} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.20.4

重写表达式。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + 5 \frac{\cos^{2} (\frac{π}{10})}{8} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.21

组合 $5$ 和 $\frac{\cos^{2} (\frac{π}{10})}{8}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10})}{8} {(\frac{i \sin (\frac{π}{10})}{4})}^{3} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.22

使用幂法则 ${(a b)}^{n} = a^{n} b^{n}$ 分解指数。

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解题步骤 5.1.22.1

对 $\frac{i \sin (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10})}{8} \cdot \frac{{(i \sin (\frac{π}{10}))}^{3}}{4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.22.2

对 $i \sin (\frac{π}{10})$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10})}{8} \cdot \frac{i^{3} \sin^{3} (\frac{π}{10})}{4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.23

合并。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10}) (i^{3} \sin^{3} (\frac{π}{10}))}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.24

化简分子。

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解题步骤 5.1.24.1

因式分解出 $i^{2}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10}) (i^{2} \cdot i) \sin^{3} (\frac{π}{10})}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.24.2

将 $i^{2}$ 重写为 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10}) (- 1 \cdot i) \sin^{3} (\frac{π}{10})}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.24.3

将 $- 1 i$ 重写为 $- i$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{5 \cos^{2} (\frac{π}{10}) \cdot - 1 i \sin^{3} (\frac{π}{10})}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.24.4

合并指数。

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解题步骤 5.1.24.4.1

提取负因数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- (5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10}))}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.24.4.2

将 $5$ 乘以 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 (\cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10}))}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{8 \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25

化简分母。

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解题步骤 5.1.25.1

将 $8$ 重写为 $2^{3}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{3} \cdot 4^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25.2

将 $4$ 重写为 $2^{2}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{3} \cdot {(2^{2})}^{3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25.3

将 ${(2^{2})}^{3}$ 中的指数相乘。

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解题步骤 5.1.25.3.1

运用幂法则并将指数相乘， ${(a^{m})}^{n} = a^{m n}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{3} \cdot 2^{2 \cdot 3}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25.3.2

将 $2$ 乘以 $3$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{3} \cdot 2^{6}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25.4

使用幂法则 $a^{m} a^{n} = a^{m + n}$ 合并指数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{3 + 6}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.25.5

将 $3$ 和 $6$ 相加。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{2^{9}} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.26

对 $2$ 进行 $9$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{- 5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.27

将负号移到分数的前面。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + 5 \frac{\cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.28

组合 $5$ 和 $\frac{\cos (\frac{π}{10})}{4}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10})}{4} {(\frac{i \sin (\frac{π}{10})}{4})}^{4} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.29

使用幂法则 ${(a b)}^{n} = a^{n} b^{n}$ 分解指数。

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解题步骤 5.1.29.1

对 $\frac{i \sin (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10})}{4} \cdot \frac{{(i \sin (\frac{π}{10}))}^{4}}{4^{4}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.29.2

对 $i \sin (\frac{π}{10})$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10})}{4} \cdot \frac{i^{4} \sin^{4} (\frac{π}{10})}{4^{4}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.30

合并。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) (i^{4} \sin^{4} (\frac{π}{10}))}{4 \cdot 4^{4}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.31

通过指数相加将 $4$ 乘以 $4^{4}$ 。

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解题步骤 5.1.31.1

将 $4$ 乘以 $4^{4}$ 。

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解题步骤 5.1.31.1.1

对 $4$ 进行 $1$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) (i^{4} \sin^{4} (\frac{π}{10}))}{4^{1} \cdot 4^{4}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.31.1.2

使用幂法则 $a^{m} a^{n} = a^{m + n}$ 合并指数。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) (i^{4} \sin^{4} (\frac{π}{10}))}{4^{1 + 4}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.31.2

将 $1$ 和 $4$ 相加。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) (i^{4} \sin^{4} (\frac{π}{10}))}{4^{5}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.32

化简分子。

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解题步骤 5.1.32.1

将 $i^{4}$ 重写为 $1$ 。

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解题步骤 5.1.32.1.1

将 $i^{4}$ 重写为 ${(i^{2})}^{2}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) {(i^{2})}^{2} \sin^{4} (\frac{π}{10})}{4^{5}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.32.1.2

将 $i^{2}$ 重写为 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) {(- 1)}^{2} \sin^{4} (\frac{π}{10})}{4^{5}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.32.1.3

对 $- 1$ 进行 $2$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \cdot 1 \sin^{4} (\frac{π}{10})}{4^{5}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.32.2

将 $5$ 乘以 $1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{4^{5}} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.33

对 $4$ 进行 $5$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + {(\frac{i \sin (\frac{π}{10})}{4})}^{5}$

解题步骤 5.1.34

使用幂法则 ${(a b)}^{n} = a^{n} b^{n}$ 分解指数。

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解题步骤 5.1.34.1

对 $\frac{i \sin (\frac{π}{10})}{4}$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{{(i \sin (\frac{π}{10}))}^{5}}{4^{5}}$

解题步骤 5.1.34.2

对 $i \sin (\frac{π}{10})$ 运用乘积法则。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i^{5} \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.35

化简分子。

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解题步骤 5.1.35.1

因式分解出 $i^{4}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i^{4} i \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.35.2

将 $i^{4}$ 重写为 $1$ 。

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解题步骤 5.1.35.2.1

将 $i^{4}$ 重写为 ${(i^{2})}^{2}$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{{(i^{2})}^{2} i \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.35.2.2

将 $i^{2}$ 重写为 $- 1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{{(- 1)}^{2} i \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.35.2.3

对 $- 1$ 进行 $2$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{1 i \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.35.3

将 $i$ 乘以 $1$ 。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i \sin^{5} (\frac{π}{10})}{4^{5}}$

解题步骤 5.1.36

对 $4$ 进行 $5$ 次方运算。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i \sin^{5} (\frac{π}{10})}{1024}$

解题步骤 5.2

化简表达式。

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解题步骤 5.2.1

将 $\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 \cos^{4} (\frac{π}{10}) i \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 \cos^{2} (\frac{π}{10}) i \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i \sin^{5} (\frac{π}{10})}{1024}$ 中的因式重新排序。

$\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 i \cos^{4} (\frac{π}{10}) \sin (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} - \frac{5 i \cos^{2} (\frac{π}{10}) \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i \sin^{5} (\frac{π}{10})}{1024}$

解题步骤 5.2.2

将 $\frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 i \cos^{4} (\frac{π}{10}) \sin (\frac{π}{10})}{1024}$ 和 $- \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512}$ 重新排序。

$- \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 i \cos^{4} (\frac{π}{10}) \sin (\frac{π}{10})}{1024} - \frac{5 i \cos^{2} (\frac{π}{10}) \sin^{3} (\frac{π}{10})}{512} + \frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} + \frac{i \sin^{5} (\frac{π}{10})}{1024}$

解题步骤 5.2.3

将 $- \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 i \cos^{4} (\frac{π}{10}) \sin (\frac{π}{10})}{1024} - \frac{5 i \cos^{2} (\frac{π}{10}) \sin^{3} (\frac{π}{10})}{512}$ 和 $\frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024}$ 重新排序。

$\frac{5 \cos (\frac{π}{10}) \sin^{4} (\frac{π}{10})}{1024} - \frac{5 \cos^{3} (\frac{π}{10}) \sin^{2} (\frac{π}{10})}{512} + \frac{\cos^{5} (\frac{π}{10})}{1024} + \frac{5 i \cos^{4} (\frac{π}{10}) \sin (\frac{π}{10})}{1024} - \frac{5 i \cos^{2} (\frac{π}{10}) \sin^{3} (\frac{π}{10})}{512} + \frac{i \sin^{5} (\frac{π}{10})}{1024}$

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