fun-lim

Question: Let $f(\theta )=\sin \theta (\sin \theta +\sin 3\theta )$, then $f(\theta )$



1) $\ge 0$ only when $\theta \ge 0$
2) $\le 0$ for all real $\theta $
3) $\ge 0$ for all real $\theta $
4) $\le 0$only when $\theta \le 0$
Solution: Explanation: No Explanation
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