sin(∏－x/2)化简

sin(∏－x/2)化简 化简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 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1) 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3) sin^2(x) -con^2(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sin(2x-y)*sin y+cos(2x-y)*sin y 化简：[sin（2π－2）cos（π＋x）tan（π－x）]/[cos（π－x）sin（3π－x）sin...化简：[sin（2π－2）cos（π＋x）tan（π－x）]/[cos（π－x）sin（3π－x）sin（－π－x）] 化简Sin（90度－2X） 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】