Question

Решите уравнение 
2sin2x-1=0 , x=?

Answer 1

$2sin 2x-1=0\ \ sin2x=0.5\ \ 2x=(-1)^kcdot frac{pi}{6} + pi k,k in mathbb{Z}\ \ x=(-1)^kcdotfrac{pi}{12}+frac{pi k}{2} ,k in mathbb{Z}$