1. ## solve

How do i solve the equation:

3 cos x - sin x/2 - 1 = 0

in the interval 0<x<720

Thx!

2. Hi

$\cos x = 1 - 2\sin^2\left(\frac{x}{2}\right)$

which leads to a quadratic in $\sin\left(\frac{x}{2}\right)$