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?

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*sin 3x)sin^2 x+（cos x*cos 3x)cos^2 x 如何变到1/2[(cos 2x-cos4x)sin^2x+(cos2x+cos4x)cos^2x] 1-(sin^6x+cos^6x)=3sin^2xcos^2x 如何证明? cosh (x + y)已知cos (x + y) = cos x cos y − sin x sin y求：cosh (x + y)再补充：求的是如何将cosh (x + y) 变成coshx cos hy - sin hx sin hy而不是证明cos h(x + y) = coshx cos hy - sin hx sin hy 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 如何将y=(sin^2(x/4)+cos^2(x/4))^2-2sin^2(x/4)cos^2(x/4)变形到(3/4)+(1/4)cosx? cos(x+y)-cosx如何等于-2sin[(2x+y)/2]sin(y/2), 将2cos x-2sin x化成Asin(x+φ的形式) 如何将y=4sin(2x+pai/3)变化成y=4cos(2x-pai/6),指图像变化,如何描述,速求!多谢! 2cos x (sin x -cos x)+1 y=2cos x (sin x+cos x) 化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x) sin x cos x cos 2x 化简 (sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x? 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 化简 cos^2(x)*sin^2(x)-sin^2(x)