cosnxIm sorry but cosnx is not a valid mathematical expression or function Can you provide more context or information so I can better understand what you are askingcosnx等于多少cosnx是三角函数中的余弦函数其中n是一个常数x是

cos(nx)的同项公式是cos(nx) = cos^n(x) - C(n,2)sin^2(x)cos^(n-2)(x) + C(n,4)sin^4(x)cos^(n-4)(x) - ...，其中C(n,k)是组合数，表示从n个元素中选取k个元素的组合数。

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