y=(sin(x+π/6))^2=[1-cos(2x+π/3)]/2对称轴 x=m则 cos(2m+π/3)=±12m+π/3=kπ2m=kπ-π/3m=kπ/2-π/6所以对称轴 x=kπ/2-π/6,函数y=sin2x+acos2x的对称轴也是 x=kπ/2-π/6,f(0)=f(kπ-π/3)a=sin(2kπ-π/3)+...