cos^2x-sin^2x 怎么化简

cos^2x-sin^2x 怎么化简 2cos(x/2)(3^(1/2)sin(x/2)-cos(x/2))怎么化简? 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 (sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x? 怎么证明2(1-sin x)(1+cos x)=(1-sin x+cos x)^2 cos^2 x - sin^2 x 是怎么化简=cos 2x cos^2 x - sin^2 x 是怎么化简=cos 2x的? (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? lim(sin(x^2*cos(1/x)))/x怎么做? y=cos^2(2x)-sin^2(2x)=,怎么化简 y=sin^2x-2sinxcosx-cos^2x怎么化简 sin^2x+2sinx+3cos^2x怎么化简 怎么化简cos(2x-π/3)-sin(2x-π/3), 函数y=cos²2x-sin²2x怎么化简 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? 如何将sin(2x)*cos(x)+sin^2(x) 展开为sin(x)的表达式?或者如何化简? Sin^x怎么变化成 1-cos(2x) /2 sin x 3 cos x =2怎么解?