trigonometry

Question: If $\cos \theta =\frac{-1}{2}$and ${{0}^{o}}<\theta <{{360}^{o}}$, then the values of $\theta $are

1) ${{120}^{o}}$and ${{300}^{o}}$

2) ${{60}^{o}}$and ${{120}^{o}}$

3) ${{120}^{o}}$and ${{240}^{o}}$

4) ${{60}^{o}}$and ${{240}^{o}}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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