已知f（cosx）=cos17x,求f(sinx)的值

分类: 作业答案 • 2021-11-13 00:40:57

问题描述：

答

f(sinx)
=f[cos(π/2-x)]
=cos[17(π/2-x)]
=cos(4×2π+π/2-17x)
=cos(π/2-17x)
=sin17x