已知sin(x+π)=4/5,且sinxcosx
已知f(x)=cos^2x+sinxcosx g(x)=2sin(x+π/4)sin(x-π/4)
已知f(x)=5cos²x+sin²x-(4根号3)sinxcosx
已知函数f(x)=sin^2 x+2根号3sinxcosx+sin(x+π/4)sin(x-π/4),x属于R,求f(x
已知函数f(x)=5根号3cos平方x+根号3sin平方x-4sinxcosx(π/4≤x≤7π/24)
已知函数f(x)=sin^2x+sinxcosx
已知函数f(x)=cos^4x-2sinxcosx-sin^4x
已知f(x)=cos^4x-2根号3sinxcosx-sin^4x 化简
已知函数f(x)=cos^4x-2sinxcosx-sin^4x
已知函数f(x)=cos^4(x)+(2根号3)sinxcosx-sin^4(x)
已知函数f(x)=cos 4 x-2sinxcosx-sin 4 x
已知函数f(x)=cos^4x+2√3sinxcosx-sin^4x
(2012•江苏二模)已知函数f(x)=sin(π4+x)sin(π4-x)+3sinxcosx(x∈R)