cos^4x-sin^4x+2sin^2x=?
问题描述:
cos^4x-sin^4x+2sin^2x=?
答
cos^4x-sin^4x+2sin^2x=cos^2x-sin^2x+2sin^2x=1
cos^4x-sin^4x+2sin^2x=?
cos^4x-sin^4x+2sin^2x=cos^2x-sin^2x+2sin^2x=1