化简：sin^2`x/(sinx-cosx)- (sinx+cosx)/tan^2`x - 1.

sin(2x+y)/sinx-2cos(x+y) 化简 化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1 化简cosθsinx-sin(x-θ)+(tanθ-2)sinx-sinθ已知函数f(x)=cosθsinx-sin(x-θ)+(tanθ-2)sinx-sinθ的最小值为0,求sinθ的值. 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 化简cos(x+y)sinx-sin(x+y)cosx sinx(sin^-1(X)/cos^-1(x) 化简 化简((sinx)^4)-sin²x+cos²x 为什么2sin(x/2)cos(x/2)=sinx 求化简(sinx+tanx)/cos^2x+sin^2x+cosx sinx*( cos x)^3/(1+sin^2x)的不定积分 sinx+cosx/sinx-cosx=2 求sinx/cos^3x +cosx/sin^3x 化简 3√15sin x+3√5cos x还有3/2cos x- √3 /2sinx 化简:(1+sin^2x-cos^2x-sinx)/(2sinxcosx-cosx) 化简sin^2x/(1+cosx)-cos^2x/(1+sinx) 化简sinx+sin(x+2π/3)+cos(x+5π/6） 化简 sinx+sin(x+2π/3)+cos(x+5π/6）