已知函数f（x）=cos 4 x-2sinxcosx-sin 4 x

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-2sinxcosx-sin^4x 已知函数f(x)=cos^4x+2√3sinxcosx-sin^4x 已知函数f(x)=sin^4-2根号3sinxcosx-cos^4x+1 函数f（x）=sin^4x+2sinxcosx+cos^4x 的最大值是多少? 已知函数f（x）=sin^2x-2sinxcosx+3cos^2x 已知函数f（x）=sin^2x+2sinxcosx+3cos^x 已知函数f(x)=sin^2x+2sinxcosx-cos^2x,x∈R 已知函数f(x)=sin^2x+2sinxcosx-cos^2x,x属于R 已知函数f(x)=sin^x+根号3sinxcosx+2cos^x,x属于R