已知(1+sin x)/cos x=-1/2,则cos/(sin x-1)=?
已知(1+sin x)/cos x=1/2,则cos x/(sin x-1)的值是
已知f(x)=sin(x/2) + cos(x/2) +[cos(x/2)]^2-1/2
已知函数f(x)=2Cos x(Sin x-Cos x)+1
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
已知fx=2/√3sin 2x-2/1[cos^x-sin^x]-1
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
已知sin x+cos x=-1/5(0
若SIN X*COS X =1/3,已知0
已知sin X+cos X=m,|m|小于等于根号2且|m|不等于1,求sin X^3+cos X^3,sin X^4+
证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)
若sin x/2-cos x/2=1/3,则sin x=
若sin x/2 - cos x/2 = 1/3,则sin x=?