SIN(30度-X)=1\3,则COS(120度+2X)等于多少.
SIN(30度-X)=1\3,则COS(120度+2X)等于多少.
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
若sin(30-x)=1/3,则cos(120+2x)等于?
sin x(sin x+cos x)=1求x等于多少
f(x)=cos^3x+sin^2-cosx上的最大值等于多少?
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+
sin(-x) cos(-x)等于多少
sin^3x-cos^3x化简等于多少
sin^2(x)cos^2(x)积分等于多少
cos^2x-sin^2x等于多少?
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
若sin x/2-cos x/2=1/3,则sin x=