若sin(兀/3一x)=1/4,则cos(兀/3+2x)等于
若sin(兀/3一x)=1/4,则cos(兀/3+2x)等于
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X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+
若sin(30-x)=1/3,则cos(120+2x)等于?
1)诺sin(π/6-x)=1/3,则cos(2π/3+2x)等于
若sin x/2-cos x/2=1/3,则sin x=
若sin x/2 - cos x/2 = 1/3,则sin x=?
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
已知sin(x-4分之π)等于3分之1,则cos(4分之π+x)等于?
y=sin^2x-3sinxcosx+4cos^2x是否等于y=sin^2x+cos^2x+3cos^2x-3/2*si
设(2cosx-sinx)(sin^2x+2cos^2x)=0,则(2cos^2x+sin^2x)/(1+tanx)等于
sin x(sin x+cos x)=1求x等于多少