三角学 示例

展开三角式 cos(3x)^2-sin(3x)^2
cos2(3x)-sin2(3x)cos2(3x)sin2(3x)
解题步骤 1
因为两项都是完全平方数,所以使用平方差公式 a2-b2=(a+b)(a-b) 进行因式分解,其中 a=cos(3x)b=sin(3x)
(cos(3x)+sin(3x))(cos(3x)-sin(3x))
解题步骤 2
化简项。
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解题步骤 2.1
化简每一项。
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解题步骤 2.1.1
使用三倍角公式把 cos(3x) 转换为 4cos3(x)-3cos(x)
(4cos3(x)-3cos(x)+sin(3x))(cos(3x)-sin(3x))
解题步骤 2.1.2
使用正弦三倍角公式。
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(cos(3x)-sin(3x))
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(cos(3x)-sin(3x))
解题步骤 2.2
化简每一项。
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解题步骤 2.2.1
使用三倍角公式把 cos(3x) 转换为 4cos3(x)-3cos(x)
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)-sin(3x))
解题步骤 2.2.2
使用正弦三倍角公式。
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)-(-4sin3(x)+3sin(x)))
解题步骤 2.2.3
运用分配律。
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)-(-4sin3(x))-(3sin(x)))
解题步骤 2.2.4
-4 乘以 -1
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)+4sin3(x)-(3sin(x)))
解题步骤 2.2.5
3 乘以 -1
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)+4sin3(x)-3sin(x))
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)+4sin3(x)-3sin(x))
(4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)+4sin3(x)-3sin(x))
解题步骤 3
将第一个表达式中的每一项与第二个表达式中的每一项相乘来展开 (4cos3(x)-3cos(x)-4sin3(x)+3sin(x))(4cos3(x)-3cos(x)+4sin3(x)-3sin(x))
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4cos3(x)(4sin3(x))+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(4cos3(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(4cos3(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4
化简项。
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解题步骤 4.1
合并 4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4cos3(x)(4sin3(x))+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(4cos3(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(4cos3(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x)) 中相反的项。
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解题步骤 4.1.1
按照 4cos3(x)(4sin3(x))-4sin3(x)(4cos3(x)) 重新排列因数。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+44cos3(x)sin3(x)+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-44cos3(x)sin3(x)-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(4cos3(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.2
44cos3(x)sin3(x) 中减去 44cos3(x)sin3(x)
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))+0-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(4cos3(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.3
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))0 相加。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(4cos3(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.4
按照 4cos3(x)(-3sin(x))3sin(x)(4cos3(x)) 重新排列因数。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-34cos3(x)sin(x)-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+34cos3(x)sin(x)+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.5
-34cos3(x)sin(x)34cos3(x)sin(x) 相加。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+0+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.6
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))0 相加。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2
化简每一项。
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解题步骤 4.2.1
使用乘法的交换性质重写。
44cos3(x)cos3(x)+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.2
通过指数相加将 cos3(x) 乘以 cos3(x)
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解题步骤 4.2.2.1
移动 cos3(x)
44(cos3(x)cos3(x))+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.2.2
使用幂法则 aman=am+n 合并指数。
44cos(x)3+3+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.2.3
33 相加。
44cos6(x)+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
44cos6(x)+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.3
4 乘以 4
16cos6(x)+4cos3(x)(-3cos(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.4
通过指数相加将 cos3(x) 乘以 cos(x)
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解题步骤 4.2.4.1
移动 cos(x)
16cos6(x)+4(cos(x)cos3(x))-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.4.2
cos(x) 乘以 cos3(x)
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解题步骤 4.2.4.2.1
cos(x) 进行 1 次方运算。
16cos6(x)+4(cos1(x)cos3(x))-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.4.2.2
使用幂法则 aman=am+n 合并指数。
16cos6(x)+4cos(x)1+3-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)+4cos(x)1+3-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.4.3
13 相加。
16cos6(x)+4cos4(x)-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)+4cos4(x)-3-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.5
-3 乘以 4
16cos6(x)-12cos4(x)-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.6
通过指数相加将 cos(x) 乘以 cos3(x)
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解题步骤 4.2.6.1
移动 cos3(x)
16cos6(x)-12cos4(x)-3(cos3(x)cos(x))4-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.6.2
cos3(x) 乘以 cos(x)
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解题步骤 4.2.6.2.1
cos(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-3(cos3(x)cos1(x))4-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.6.2.2
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-3cos(x)3+14-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-3cos(x)3+14-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.6.3
31 相加。
16cos6(x)-12cos4(x)-3cos4(x)4-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-3cos4(x)4-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.7
4 乘以 -3
16cos6(x)-12cos4(x)-12cos4(x)-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.8
乘以 -3cos(x)(-3cos(x))
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解题步骤 4.2.8.1
-3 乘以 -3
16cos6(x)-12cos4(x)-12cos4(x)+9cos(x)cos(x)-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.8.2
cos(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9(cos1(x)cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.8.3
cos(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9(cos1(x)cos1(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.8.4
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos(x)1+1-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.8.5
11 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.9
4 乘以 -3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)-3cos(x)(-3sin(x))-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.10
-3 乘以 -3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)-4sin3(x)(-3cos(x))-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.11
-3 乘以 -4
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-4sin3(x)(4sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.12
使用乘法的交换性质重写。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-44sin3(x)sin3(x)-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.13
通过指数相加将 sin3(x) 乘以 sin3(x)
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解题步骤 4.2.13.1
移动 sin3(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-44(sin3(x)sin3(x))-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.13.2
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-44sin(x)3+3-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.13.3
33 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-44sin6(x)-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-44sin6(x)-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.14
-4 乘以 4
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.15
通过指数相加将 sin3(x) 乘以 sin(x)
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解题步骤 4.2.15.1
移动 sin(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4(sin(x)sin3(x))-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.15.2
sin(x) 乘以 sin3(x)
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解题步骤 4.2.15.2.1
sin(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4(sin1(x)sin3(x))-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.15.2.2
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4sin(x)1+3-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4sin(x)1+3-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.15.3
13 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4sin4(x)-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)-4sin4(x)-3+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.16
-3 乘以 -4
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.17
-3 乘以 3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.18
通过指数相加将 sin(x) 乘以 sin3(x)
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解题步骤 4.2.18.1
移动 sin3(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3(sin3(x)sin(x))4+3sin(x)(-3sin(x))
解题步骤 4.2.18.2
sin3(x) 乘以 sin(x)
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解题步骤 4.2.18.2.1
sin(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3(sin3(x)sin1(x))4+3sin(x)(-3sin(x))
解题步骤 4.2.18.2.2
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3sin(x)3+14+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3sin(x)3+14+3sin(x)(-3sin(x))
解题步骤 4.2.18.3
31 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3sin4(x)4+3sin(x)(-3sin(x))
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+3sin4(x)4+3sin(x)(-3sin(x))
解题步骤 4.2.19
4 乘以 3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)+3sin(x)(-3sin(x))
解题步骤 4.2.20
乘以 3sin(x)(-3sin(x))
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解题步骤 4.2.20.1
-3 乘以 3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin(x)sin(x)
解题步骤 4.2.20.2
sin(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9(sin1(x)sin(x))
解题步骤 4.2.20.3
sin(x) 进行 1 次方运算。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9(sin1(x)sin1(x))
解题步骤 4.2.20.4
使用幂法则 aman=am+n 合并指数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin(x)1+1
解题步骤 4.2.20.5
11 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
解题步骤 4.3
通过加上各项进行化简。
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解题步骤 4.3.1
合并 16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x) 中相反的项。
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解题步骤 4.3.1.1
按照 -12cos(x)sin3(x)12sin3(x)cos(x) 重新排列因数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12sin3(x)cos(x)+9cos(x)sin(x)+12sin3(x)cos(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.1.2
-12sin3(x)cos(x)12sin3(x)cos(x) 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+9cos(x)sin(x)+0-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.1.3
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+9cos(x)sin(x)0 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+9cos(x)sin(x)-16sin6(x)+12sin4(x)-9sin(x)cos(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.1.4
按照 9cos(x)sin(x)-9sin(x)cos(x) 重新排列因数。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+9cos(x)sin(x)-16sin6(x)+12sin4(x)-9cos(x)sin(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.1.5
9cos(x)sin(x) 中减去 9cos(x)sin(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+0-16sin6(x)+12sin4(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.1.6
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)0 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-16sin6(x)+12sin4(x)+12sin4(x)-9sin2(x)
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-16sin6(x)+12sin4(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.2
-12cos4(x) 中减去 12cos4(x)
16cos6(x)-24cos4(x)+9cos2(x)-16sin6(x)+12sin4(x)+12sin4(x)-9sin2(x)
解题步骤 4.3.3
12sin4(x)12sin4(x) 相加。
16cos6(x)-24cos4(x)+9cos2(x)-16sin6(x)+24sin4(x)-9sin2(x)
16cos6(x)-24cos4(x)+9cos2(x)-16sin6(x)+24sin4(x)-9sin2(x)
16cos6(x)-24cos4(x)+9cos2(x)-16sin6(x)+24sin4(x)-9sin2(x)
 [x2  12  π  xdx ]