己知sin(兀/3-x)=3/5则cos(兀/3-x)=
己知函数f(x)=根号3sin x/4 cos x/4+cos平方x/4+1/2.(1)...
己知R是实数集,X属于R、平面向量a=(1、sin平方x-cos平方x)平面向量b=(cos(2x-兀/3),1),函数
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
如下己知函数f(x)=3sin平方x+2根号3sinxcosx+cos平方x,x属于R.
关于三角函数,sin(x/2)cos(x/2 兀/3) cos(x/2)sin(x/2 兀/3)=sin(x x 兀/3
求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).
已知f(x)=5cos²x+sin²x-(4根号3)sinxcosx
若f(sin x)=3-cos 2x,则f(cos x)=( )
cos x sin x=3,求cos x+sin x
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
若sin(兀/3一x)=1/4,则cos(兀/3+2x)等于