First step . We have
so, the equality is true for
What difficulties have you had in the second step?
Remark . If the question is for then, take into account that:
and
Fernando Revilla
First step . We have
so, the equality is true for
What difficulties have you had in the second step?
Remark . If the question is for then, take into account that:
and
Fernando Revilla
Suppose:
Then, prove:
Fernando Revilla