Question

cos(x/2)=0,5 розвяжить бистро

Answer 1

$cos( frac{x}{2} ) = 0.5 \ cos( frac{x}{2} ) = frac{1}{2} \ frac{x}{2} = ± arccos( frac{1}{2} ) \ frac{x}{2} = ± frac{pi}{3} + 4pi n \ x = ± frac{2pi}{3} + 4pi n, : n in Z$