Решенный интеграл вида ∫x^2cos(αx)dx

Solving an indefinite integral of the form ∫x^2cos(αx)dx by integration by parts, where α takes the values 1,2,3,4,5...n
An example of solving integrals for α=3,4,5
∫x^2cos(αx)dx, ∫x^2cos(3x)dx, ∫x^2cos(4x)dx, ∫x^2cos(5x)dx

The solution is in PDF format