The general value \( \theta \) is obtained from the equation \( \cos 2 \theta=\sin \alpha \), is...
The general value \( \theta \) is obtained from the equation \( \cos 2 \theta=\sin \alpha \), is [where \( \mathrm{n} \in \mathrm{I} \) ]
(1) \( 2 \theta=\frac{\pi}{2}-\alpha \)
(2) \( \theta=2 n \pi \pm\left(\frac{\pi}{2}-\alpha\right) \)
(3) \( \theta=\frac{n \pi+(-1)^{n} \alpha}{2} \)
(4) \( \theta=\mathrm{n} \pi \pm\left(\frac{\pi}{4}-\frac{\alpha}{2}\right) \)
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