已知函数f(x)=sin(2x-A)+1满足f((π/3)+x)=f((π/3)-x),则A等于多少?
问题描述:
已知函数f(x)=sin(2x-A)+1满足f((π/3)+x)=f((π/3)-x),则A等于多少?
答
A=kpi-pi/6
答
令x=π/3 代入f((π/3)+x)=f((π/3)-x)f(0)=sinA+1=f(2π/3)=sin((4π/3)-A)+1sinA=sin((4π/3)-A)=sin(4π/3)cosA-cos(4π/3)sinA/2((1-sinA)^0.5=-3^0.5/2((1-(sinA)^2)^0.5)+0.5sinA移项得0.5sinA=-3^0.5...