tan(x/2)*cos(x/2)平方*2怎样算出等于sinx?
化简tan(3x/2)-tan(x/2)-sinx/(cos(3x/2)*cos(x/2))
tan(3x/2)-tan(x/2)-2sinx/(cosx+cos(2x))=?
化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1
sinx=根号3/2 90〈X〈180度 求 cos x ,tan x ,cot x,sec x,csc x 等于多少
化简cosθsinx-sin(x-θ)+(tanθ-2)sinx-sinθ
已知(2sinx+cosx)(sinx+2cosx-3)=0 求sin 2x+cos 2x/tan 2x
cos^2x sinx 不定积分
已知tan(x+(5π)/4)=2,求(sinx+cosx)/(sinx-cosx)+sin2x+cos(x)^2
(sin^x/sinx-cosx)-sinx+cosx/tan^2x-1
(2sinx*cosx)/sin^2x+cos^2x=(2tanx)/tan^2x+1 怎么推导的?
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
请问怎么证明sinX+sin(X+Y)+sin(X+2Y)/cosX+cos(X+Y)+cos(X+2Y)=tan(X+