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Answer :

[tex]\begin{gathered} -6cos\theta\text{ + 4 = 4} \\ -6cos\theta\text{ = 0} \\ cos\theta\text{ = 0} \\ \theta\text{ = }\frac{\pi}{2}\text{ or }\frac{3\pi}{2} \end{gathered}[/tex]

Correct option: 6th option

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