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三角学 示例
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) 和 b=sin(3x)。
(cos(3x)+sin(3x))(cos(3x)-sin(3x))
解题步骤 2
解题步骤 2.1
化简每一项。
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。
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
将 -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
将 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
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。
解题步骤 4.1.1
按照 4cos3(x)(4sin3(x)) 和 -4sin3(x)(4cos3(x)) 重新排列因数。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))+4⋅4cos3(x)sin3(x)+4cos3(x)(-3sin(x))-3cos(x)(4cos3(x))-3cos(x)(-3cos(x))-3cos(x)(4sin3(x))-3cos(x)(-3sin(x))-4⋅4cos3(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
从 4⋅4cos3(x)sin3(x) 中减去 4⋅4cos3(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
将 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)) 和 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)) 和 3sin(x)(4cos3(x)) 重新排列因数。
4cos3(x)(4cos3(x))+4cos3(x)(-3cos(x))-3⋅4cos3(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))+3⋅4cos3(x)sin(x)+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.1.5
将 -3⋅4cos3(x)sin(x) 和 3⋅4cos3(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
将 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)) 和 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。
解题步骤 4.2.1
使用乘法的交换性质重写。
4⋅4cos3(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)。
解题步骤 4.2.2.1
移动 cos3(x)。
4⋅4(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。
4⋅4cos(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
将 3 和 3 相加。
4⋅4cos6(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))
4⋅4cos6(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
将 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)。
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
将 cos(x) 乘以 cos3(x)。
解题步骤 4.2.4.2.1
对 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
将 1 和 3 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
将 -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)。
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
将 cos3(x) 乘以 cos(x)。
解题步骤 4.2.6.2.1
对 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+1⋅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)-3cos(x)3+1⋅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 4.2.6.3
将 3 和 1 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
将 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))。
解题步骤 4.2.8.1
将 -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
对 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
对 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
将 1 和 1 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
将 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
将 -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
将 -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)-4⋅4sin3(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)。
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)-4⋅4(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)-4⋅4sin(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
将 3 和 3 相加。
16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)-12cos(x)sin3(x)+9cos(x)sin(x)+12sin3(x)cos(x)-4⋅4sin6(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)-4⋅4sin6(x)-4sin3(x)(-3sin(x))+3sin(x)(-3cos(x))+3sin(x)(4sin3(x))+3sin(x)(-3sin(x))
解题步骤 4.2.14
将 -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)。
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
将 sin(x) 乘以 sin3(x)。
解题步骤 4.2.15.2.1
对 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
将 1 和 3 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
将 -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
将 -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)。
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
将 sin3(x) 乘以 sin(x)。
解题步骤 4.2.18.2.1
对 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+1⋅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)+3sin(x)3+1⋅4+3sin(x)(-3sin(x))
解题步骤 4.2.18.3
将 3 和 1 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
将 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))。
解题步骤 4.2.20.1
将 -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
对 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
对 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
将 1 和 1 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。
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。
解题步骤 4.3.1.1
按照 -12cos(x)sin3(x) 和 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
将 -12sin3(x)cos(x) 和 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
将 16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x)+9cos(x)sin(x) 和 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) 和 -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
从 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
将 16cos6(x)-12cos4(x)-12cos4(x)+9cos2(x) 和 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
从 -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
将 12sin4(x) 和 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)