化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1)

化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 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 cos x/sin x+sin x/(1+cos x) 化简. 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[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^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 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 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 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简sin(2x-y)*sin y+cos(2x-y)*sin y 化简【完整步骤!】1.（sin^4x-sin^2x）/secx2.sin^4x-cos^4x【这道题的正确答案是sin^2x-cos^2x】