Question

Решите уравнение ctg x/2=-1

Answer 1

$ctg frac{x}{2} =-1\ frac{x}{2} =arcctg(-1)+ pi n,n in Z\ \ frac{x}{2} = frac{3 pi }{4} + pi n,n in Z,, |cdot 2\ \ boxed{x= frac{3 pi }{2} +2 pi n,n in Z}$