化简sin(x)cos(x)cos(2x)

化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x) sin x cos x cos 2x 化简 cos x/sin x+sin x/(1+cos x) 化简. 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 化简sin^4x+cos^2x 化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x) 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x) 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 化简 1/2cos x-根号3/2sin x 根3sin x+cos x 2cos x (sin x -cos x)+1 y=2cos x (sin x+cos x) 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x