已知(1+sin x)/cos x=1/2,则cos x/(sin x-1)的值是
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
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
已知函数f(x)=sin(x/2)cos(x/2)+cos(x/2)的平方-1/2
sin(1/x)-cos(1/x)/x
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
已知2sinx=-cosx,则1+2sinxcosx/(sin^x-cos^x)的值是____.
已知sin x+cos x=-1/5(0
若SIN X*COS X =1/3,已知0