f(sinx)=2sin²x-cos2x

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/10 07:48:01

f(sinx)=2sin²x-cos2x
f(sinx)=2sin²x-cos2x

f(sinx)=2sin²x-cos2x
f(sinx)=2sin^2x-cos^2x+sin^2x
=3sin^2x-(1-sin^2x)
=4sin^2x-1
所以f(x)=4x^2-1