trigonometry

Question: If $2{{\cos }^{2}}x+3\sin x-3=0,\,\,0\le x\le {{180}^{o}}$, then $x =$

1) ${{30}^{o}},{{90}^{o}},{{150}^{o}}$

2) ${{60}^{o}},{{120}^{o}},{{180}^{o}}$

3) ${{0}^{o}},{{30}^{o}},{{150}^{o}}$

4) ${{45}^{o}},{{90}^{o}},{{135}^{o}}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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