Solve $\cos x=\frac{1}{2}$
Solve $\cos x=\frac{1}{2}$
We have, $\cos x=\frac{1}{2}=\cos \frac{\pi}{3}$
Therefore $\quad x=2 n \pi \pm \frac{\pi}{3},$ where $n \in Z$
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- [KVPY 2014]