f(x)=(sin^4 x+cos^4 x+sin^2 xcos^2 x)/(2-sin2 x）=(sin^4 x+cos^4 x+2sin^2 xcos^2 x-sin^2 xcos^2 x)/(2-sin2 x）=[(sin^2 x+cos^2 x)^2-(sinxcosx)^2]/(2-sin2x)=[1-(sinxcosx)^2]/(2-2sinxcosx)=[(1+sinxcosx)...