Question

ctg4x=-1 Помогите Плизз 

Answer 1

ctg4x=-1
4x=3*Pi/4+Pi*n; n e Z (Pi - Число "Пи")
x=3*pi/16+Pi*n/4; n e Z

Answer 2

ctg4x= -1
4x=3π/4  + πn, n∈Z
x=3π/16+πn/4 , n∈Z