Question

2cosx/2+корень из2=0

Answer 1

$cos( frac{x}{2})= -frac{ sqrt{2} }{2}$
$frac{x}{2}=+- frac{3 pi }{4} + 2pi$n;n∈Z
$x=+- frac{3 pi }{2} +4 pi n;$n∈Z