Question

Решите:
ctg (-x/2) = 1

Answer 1

$Ctg(-frac{x}{2})=1\\-Ctg(frac{x}{2})=1\\Ctgfrac{x}{2}=-1\\frac{x}{2}=frac{3pi }{4} +pi n,nez\\x=frac{3pi }{2}+2pi n,nez$