求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/2
问题描述:
求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/2
求函数f(x)=(sin^4 x+cos^4 x+sin^2 x*cos^2 x)/(2-sin2x)-sinxcosx/2+cos2x/4 的最小正周期,最大值和最小值
答
sin^4 x+cos^4 x+sin^2 x*cos^2 x =sin^4 x+cos^4 x+2sin^2 x*cos^2 x-sin^2 x*cos^2 x =(sin^2 x+cos^2 x)^2-sin^2 x*cos^2 x =1-sin^2 x*cos^2 x =(1+sinxcosx)(1-sinxcosx) 2-sin2x=2-2sinxcosx=2(1-sinxcosx) 所...