Question

Помогите:
Ctg (3x+pi/4)=-1

Answer 1

Ctg (3x+pi/4)= -1
3x + π/4 = - π/4 + πk, k∈Z
3x = -π/2 + πk, k∈z
x = -π/6 + (πk)/3, k ∈z

Answer 2

Можете еще помочь с ctg (-2pi/2; -pi/2)