Решенный интеграл вида ∫arcctg(x/α)dx

Solving an indefinite integral of the form ∫arcctg(x/α)dx by integration by parts, where α takes the values 2,3,4,5...n
An example of solving integrals for α=2.7
∫arcctg(x/α)dx, ∫arcctg(x/2)dx, ∫arcctg(x/7)dx

The solution is in PDF format