Let $f(\theta ) = \sin \theta (\sin \theta + \sin 3\theta )$, then $f(\theta )$
Let $f(\theta ) = \sin \theta (\sin \theta + \sin 3\theta )$, then $f(\theta )$
- [IIT 2000]
- A
$ \ge 0$ only when $\theta \ge 0$
- B
$ \le 0$ for all real $\theta $
- C
$ \ge 0$ for all real $\theta $
- D
$ \le 0$ only when $\theta \le 0$
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