h(x)=f(x)-g(x)= （1/2）cos(2x+2π/3)- （1/2）sin(2x+2π/3)=√2/2[√2/2 cos(2x+2π/3) -√2/2 sin(2x+2π/3)]=√2/2 cos[(2x+2π/3)+π/4] =√2/2 cos(2x+11π/12).h(x)=0时,cos(2x+11π/12) =0,2x+11π/12=kπ+...