trigonometry

Question: The equation $3{{\sin }^{2}}x+10\cos x-6=0$ is satisfied, if

1) $x=n\pi \pm {{\cos }^{-1}}(1/3)$

2) $x=2n\pi \pm {{\cos }^{-1}}(1/3)$

3) $x=n\pi \pm {{\cos }^{-1}}(1/6)$

4) $x=2n\pi \pm {{\cos }^{-1}}(1/6)$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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