Prove the following identity holds for vectors .
Proof. From a previous exercise (Section 13.14, Exercise #9(d)), we know
So, with in place of
and
in place of
in this formula we have
Prove the following identity holds for vectors .
Proof. From a previous exercise (Section 13.14, Exercise #9(d)), we know
So, with in place of
and
in place of
in this formula we have