Question

Anyone able to help?!

Answer 1

`\cos \theta = \frac 12\\\\\implies \theta = 2n\pi \pm \frac{\pi}3\\\\\text{For n =0 ~ \text{and}~ n=1}\\\\\\\theta = \frac{\pi}3 , (5\pi)/(3)\\\\\text{In degrees,}\\\\\theta = 60^(\circ) , ~ 300^(\circ)`