cos4x,2sinxcosx

∫(0~π/2)(cos^2x-cos^4x)dx的积分
求学霸们画出y=cos4x的图像,谢谢
sin4x = x^(7/3)-lnsin4x f'(x) = 7/3x^(7/3-1) - (1/sin4x)*cos4x*4
积分sin^4xcos^2x dx
不定积分 cos^4x-cos^6x