The function \( f(x)=a \sin x+\frac{1}{3} \sin 3 x \) has maximum value at \( x=\pi / 3 \). The ...

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The function \( f(x)=a \sin x+\frac{1}{3} \sin 3 x \) has maximum value at \( x=\pi / 3 \). The value of \( a \), is
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