trigonometry

Question: The values of $\theta $ satisfying $\sin 7\theta =\sin 4\theta -\sin \theta $ and $0 < \theta < \frac{\pi }{2}$ are

1) $\frac{\pi }{9},\frac{\pi }{4}$

2) $\frac{\pi }{3},\frac{\pi }{9}$

3) $\frac{\pi }{6},\frac{\pi }{9}$

4) $\frac{\pi }{3},\frac{\pi }{4}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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