Question

I took a pic of a practice problem I’m doing

Answer 1

`\begin{gathered} -6cos\theta\text{ + 4 = 4} \\ -6cos\theta\text{ = 0} \\ cos\theta\text{ = 0} \\ \theta\text{ = }(\pi)/(2)\text{ or }(3\pi)/(2) \end{gathered}`

Correct option: 6th option