f(x) = 1/2 cos(2x+pi/6), g(x) = 1+ 1/2 sin2x
f(x) 对称轴为2x+pi/6 = 0, 2pi, ...
x = -pi/12 +/- npi...
f(x)+g(x) = 1/2 cos2x * sqrt(3)/2 - 1/2 sin2x * 1/2 + 1 + 1/2 sin2x
= 1/2 cos2x sqrt(3)/2 + 1/2 sin2x 1/2 + 1 = 1/2 cos(2x-pi/6) + 1
最小正周期派，值域[-1/2, 3/2]
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