Mathematics

Problem

The general solution of

8 \tan^2 \frac{x}{2} = 1 + \sec x

is a.

x = 2n\pi \pm \cos^{-1}\left(\frac{-1}{3}\right)

x = 2n\pi \pm \frac{\pi}{6}

x = 2n\pi \pm \cos^{-1}\left(\frac{1}{3}\right)

d. None of these