19:08

A beautiful integral for the mind

10:11

Find the limit

12:56

Definite Integral With U-Substitution

23:17

U-Substitution 5-sample video

9:32

Du second degré pas pour les nuls

12:31

Understand u-substitution, the idea!

9:07

Invoking the Gamma Function

8:13

when can you do u substitution in your head?