若sin x*sinX>cos x*cosX,则x的取值范围是?

若sinx+sin^2x=1,则cos^2x+cos^4x=? 若sinx+sin^2x=1,则cos^2x-sinX=?急... 若sinx+sin^2x=1,则cos^2x+cos^4x=?由 sinx+sin^2x=1得 sinx=1-sin^2x=cos^2xcos^2x+cos^4x=cos^2x(1+cos^2x)=sinx(1+sinx)=sinx+sin^2x=1cos^2x(1+cos^2x)=sinx(1+sinx)怎么来的? (sinX+sinθ) .(Sinx-sinθ)=sin(x+θ).cos(x-θ)证明 若sin x*sinX>cos x*cosX,则x的取值范围是? 化简sin(x+y)sinx+cos(x+y)cosx 化简sin(x+y)sinx+cos(x+y)cosx等于? 化简cos(x+y)sinx-sin(x+y)cosx sin(2x+y)/sinx-2cos(x+y) 化简 化简cos(x+y)sinx-sin(x+y)cosx sinx*sin(x+y)+cosx*cos(x+y)等于? sinx(sin^-1(X)/cos^-1(x) 化简 cos（x+y）sinx-sin（x+y）cosx 为什么2sin(x/2)cos(x/2)=sinx 化简((sinx)^4)-sin²x+cos²x 求化简(sinx+tanx)/cos^2x+sin^2x+cosx sinx*( cos x)^3/(1+sin^2x)的不定积分 sinx/（sin^3x+cos^3x）dx不定积分