Question

Find the degree measures of the angles whose cosine is -√3 over 2

Answer 1

\[\cos^{-1} (\frac{ -\sqrt{3} }{ 2 })\]

Answer 2

It's \[\frac{ 2\pi }{ 3 }+2k \pi\]=150+2k180 or\[\frac{ 5\pi }{ 3 }+2k \pi\]=210+2k180 where k=0,1,2,........