\cos 2\theta = \sin \theta
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- 5**Question:** Find all angles \( \theta \in [0^\circ, 360^\circ] \) such that \( \cos 2\theta = \sin \theta \).
- Start with the equation:
- Use the double-angle identity for cosine:
- \cos 2\theta = 1 - 2\sin^2\theta
- - 2\sin^2\theta = \sin \theta
