求证y=sin^2x+cos^2(x+π/3)的最值
问题描述:
求证y=sin^2x+cos^2(x+π/3)的最值
答
y=sin^2x+cos^2(x+π/3)=sin2x+cos(2x+2π/3)=sin2x+cos2x*(-1/2)-sin2x*根号3/2=(1-根号3/2)sin2x-0.5cos2x=根号(2-根号3)sin(x-a)=(根号6-根号2)/2*sin(x-a)其中tana=0.5/(1-根号3/2)所以函数的最大值为(根...