$\sin 3\theta + \sin \theta = 0$ හි සාධාරණ විසඳුම සෙවීම

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• පසිඳු මධුසංක ✓ Correct answer
  $\sin C + \sin D = 2\sin(\frac{C+D}{2})\cos(\frac{C-D}{2})$ සූත්‍රය යොදන්න: $$2\sin 2\theta \cos \theta = 0$$ 1. $\sin 2\theta = 0 \implies 2\theta = n\pi \implies \theta = \frac{n\pi}{2}, n \in \mathbb{Z}$ 2. $\cos \theta = 0 \implies \theta = (2k+1)\frac{\pi}{2}, k \in \mathbb{Z}$