But that's the way !
However, you can note that the Jacobian matrix is just :
Since it's an upper triangular matrix, its determinant is just the product of the terms that are in the diagonal, namely 1.
Show that the following transformation doesn't change volumes.
My attempt : I believe I must show that the Jacobian of the transformation is worth . I'm having a hard time finding the Jacobian though. I've no clue.
I know it's wrong, but it's my attempt.