If the function `f(x) = a sin x + 1/3 sin 3x ` is maximum at `x= pi/3 ` a=?

If the function `f(x) = a sin x + 1/3 sin 3x ` is maximum at `x= pi/3 ` a=?
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If the function `f(x) = a sin x + 1/3 sin 3x ` is maximum at `x= pi/3 ` a=? A. 1 B. 2 C. 3 D. 4
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