对于任意实数x和整数n,已知f(sinx)=sin(4n+1)x,求f(cosx)f(cosx)=f(sin(90°-x))=sin(4n+1)(90°-x)=sin[360°n+90°-(4n+1)x] =sin[90°-(4n+1)x]=cos(4n+1)x 以下这几步看不懂sin[360°n+90°-(4n+1)x] =sin[90°-(4n+1)x]
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