Find \( a \) for which \( f(x)=\sin x-a \sin 2 x-\frac{1}{3} \sin 3...

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Find \( a \) for which \( f(x)=\sin x-a \sin 2 x-\frac{1}{3} \sin 3 x \)
\( \mathrm{P} \)
\( +2 a x \) increases throughout the number line.
W
(1) \( a1 \)
(2) \( a-1 \)
(3) \( a \in(1,2) \)
(4) None of these
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