trigonometry

Question: If ${{\sin }^{2}}\theta -2\cos \theta +\frac{1}{4}=0,$then the general value of $\theta $is

1) $n\pi \pm \frac{\pi }{3}$

2) $2n\pi \pm \frac{\pi }{3}$

3) $2n\pi \pm \frac{\pi }{6}$

4) $n\pi \pm \frac{\pi }{6}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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