# solve

• May 3rd 2009, 09:04 AM
Sundae
solve
How do i solve the equation:

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

in the interval 0<x<720

Thx!
• May 3rd 2009, 10:04 AM
running-gag
Hi

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

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