5.函数f(x)=sin(2x+$\frac{π}{3}$)图象的对称轴方程可以为( )
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| A. | x=-$\frac{π}{4}$ | B. | x=$\frac{π}{8}$ | C. | x=-$\frac{5π}{12}$ | D. | x=-$\frac{π}{2}$ |