y=Asin(wx+h) 对称轴 x = π/2 +kπ
y=Acos(wx+h) 对称轴 x=kπ
y=Atan(wx+h) 对称轴 x=kπ/2y=A*sin(wx+h)

对称轴x =(π/2 +kπ-h)/w