三角学示例

\frac{\sin (x)}{\sqrt{1 - \sin^{2} (x)}}

$\frac{\sin (x)}{\sqrt{1 - \sin^{2} (x)}}$

解题步骤 1

化简分母。

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解题步骤 1.1

将

1

$1$ 重写为

1^{2}

$1^{2}$ 。

\frac{\sin (x)}{\sqrt{1^{2} - \sin^{2} (x)}}

$\frac{\sin (x)}{\sqrt{1^{2} - \sin^{2} (x)}}$

解题步骤 1.2

因为两项都是完全平方数，所以使用平方差公式

a^{2} - b^{2} = (a + b) (a - b)

$a^{2} - b^{2} = (a + b) (a - b)$ 进行因式分解，其中

a = 1

$a = 1$ 和

b = \sin (x)

$b = \sin (x)$ 。

\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$

\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$

解题步骤 2

将

\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$ 乘以

\frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$ 。

\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}} \cdot \frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}} \cdot \frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$

解题步骤 3

合并和化简分母。

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解题步骤 3.1

将

\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x)}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$ 乘以

\frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}$ 。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))} \sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{\sqrt{(1 + \sin (x)) (1 - \sin (x))} \sqrt{(1 + \sin (x)) (1 - \sin (x))}}$

解题步骤 3.2

对

\sqrt{(1 + \sin (x)) (1 - \sin (x))}

$\sqrt{(1 + \sin (x)) (1 - \sin (x))}$ 进行

1

$1$ 次方运算。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1} \sqrt{(1 + \sin (x)) (1 - \sin (x))}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1} \sqrt{(1 + \sin (x)) (1 - \sin (x))}}$

解题步骤 3.3

对

\sqrt{(1 + \sin (x)) (1 - \sin (x))}

$\sqrt{(1 + \sin (x)) (1 - \sin (x))}$ 进行

1

$1$ 次方运算。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1} {\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1} {\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1}}$

解题步骤 3.4

使用幂法则

a^{m} a^{n} = a^{m + n}

$a^{m} a^{n} = a^{m + n}$ 合并指数。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1 + 1}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{1 + 1}}$

解题步骤 3.5

将

1

$1$ 和

1

$1$ 相加。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{2}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{2}}$

解题步骤 3.6

将

{\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{2}

${\sqrt{(1 + \sin (x)) (1 - \sin (x))}}^{2}$ 重写为

(1 + \sin (x)) (1 - \sin (x))

$(1 + \sin (x)) (1 - \sin (x))$ 。

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解题步骤 3.6.1

使用

\sqrt[n]{a^{x}} = a^{\frac{x}{n}}

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ ，将

\sqrt{(1 + \sin (x)) (1 - \sin (x))}

$\sqrt{(1 + \sin (x)) (1 - \sin (x))}$ 重写成

{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2}}

${((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2}}$ 。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{({((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2}})}^{2}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{({((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2}})}^{2}}$

解题步骤 3.6.2

运用幂法则并将指数相乘，

{(a^{m})}^{n} = a^{m n}

${(a^{m})}^{n} = a^{m n}$ 。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2} \cdot 2}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{1}{2} \cdot 2}}$

解题步骤 3.6.3

组合

\frac{1}{2}

$\frac{1}{2}$ 和

2

$2$ 。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{2}{2}}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{2}{2}}}$

解题步骤 3.6.4

约去

2

$2$ 的公因数。

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解题步骤 3.6.4.1

约去公因数。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{2}{2}}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{\frac{2}{2}}}$

解题步骤 3.6.4.2

重写表达式。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{1}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{1}}$

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{1}}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{{((1 + \sin (x)) (1 - \sin (x)))}^{1}}$

解题步骤 3.6.5

化简。

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}$

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}$

\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}

$\frac{\sin (x) \sqrt{(1 + \sin (x)) (1 - \sin (x))}}{(1 + \sin (x)) (1 - \sin (x))}$

三角学 示例

三角学示例