let be a positive oriented orthonormal basis.

Define a new basis

* Show that also is a orthonormal basis.

* determine the coordinates for the vector in the base

and:

i thought this would be the coordinates for the vector u:

=

I need some advice for the first problem on how to show that is an orthonormal basis to.

Thanks!

Edit: dont need help to show that is an orthonormal basis. Figured it out right after i posted