已知cos x/(sin x-1)=1/2,则(1+sin x)/cos x等于?
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin x(sin x+cos x)=1求x等于多少
已知(1+sin x)/cos x=1/2,则cos x/(sin x-1)的值是
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+
设(2cosx-sinx)(sin^2x+2cos^2x)=0,则(2cos^2x+sin^2x)/(1+tanx)等于
已知f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+cos平方x.
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
2cos x (sin x -cos x)+1
化简(1)√3sin x+cos x (2)√2(sin x-cos x) (3)√2cos x-√6sin x
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
sin(-x) cos(-x)等于多少