sin^4 X-cos^4 X 怎么化简?注意：4昰次方

帮帮化简sin^4x-cos^4x(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?麻烦 (6cos^4x-sin^2x-1)/(2(2cos^2x -1))怎么化简 函数fx=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)怎么化简? sin^4 X-cos^4 X 怎么化简?注意：4昰次方 sin^2x+cos^2x)(sin^4x-sin^2xcos^2x+cos^4x) =sin^4x-sin^2xcos^2x+cos^4x 是根据什么化简的? cos^2x-sin^2x 怎么化简 sin^4x+cos^4x怎么求导数? sin x{sin x +cos x}+cos x{cos x +cos x} 化成正弦函数或余弦函数怎么化? 2cos^4x-2cos^2x+1/2除以2tan(派/4-x)sin^2(派/4+x)怎么化简 f(x)=cos(2x-兀/3）+2sin(x-兀/4)sin(x+兀/4)怎么化简 2cos(x/2)(3^(1/2)sin(x/2)-cos(x/2))怎么化简? 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简cos^4x+sin^4x 化简:cos^4(X)-sin^4(X) 化简sin^4x+cos^2x 化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x) y'=4sin(2x+π/3)cos(2x+π/3) 化简 y'=2sin(4x+2π/3).怎么化简的?