sinx(sin^-1(X)/cos^-1(x) 化简

sinx(sin^-1(X)/cos^-1(x) 化简 sinx*( cos x)^3/(1+sin^2x)的不定积分 化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1 若sinx+sin^2x=1,则cos^2x+cos^4x=? 证明成立：[cos(3x)-sin(3x)]/(cosx+sinx)=1-2sin(2x). 化简{sin(π+x)}/1+cos(3π-x)根号下(tanx-sinx)/(tanx+sinx) 若sinx+sin^2x=1,则cos^2x-sinX=?急... 求证:Sin^2 x / (sinx-cosx) - (sin x + cos x)/(ta求证:Sin^2 x / (sinx-cosx) - (sin x + cos x)/(tan^2-1) = sin x + cos x 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-1)/cosx怎么化成[sin(x/2)-cos(x/2)]/[cos(x/2)+sin(x/2 曲线Y= sin x 1_________ - __ 求导?sin x +cos x 2sinx /(sinx +cosx ) - 1/2 为什么cosX+cos²X-sinX-sin²X=（cosX-sinX）（1+sinX+cosX） cos(n+1)x=cos(nx)cosx-sin(nx)sinx这个式子是怎推出来的? 请求sinx cos nx + cosx sin nx变成sin(n+1)x的步骤 ∵sinx+sin(x+2) =2sin(x+1)cos=sin(x+1), 这一步是为什么? (sinX+sinθ) .(Sinx-sinθ)=sin(x+θ).cos(x-θ)证明 怎么证明(1/2)sinx=sin(x/2)cos(x/2)怎么证明(1/2)sinx=sin(x/2)cos(x/2) 3sinx-2cosx=0 (1)(cosx-sinx)/(cosx+sinx)+(cosx+sinx)/(cosx-sinx) (2)sin^2 x-2sinxcosx+4cos^2 x