Question

求函数f(x)=(sinx+cos^4x+sin^2xcos^2x)/2-2sinxcosx-1/2sinxcosx+1

Answer 1

题目有点怪!会不会打错了啊?

提示你哦：sin^2xcos^2x=sin^2(2x)/4

2sinxcosx=sin2x

1/2sinxcosx=sin2x/4

1/4cos2x=1/4-sin^2x/2