If we don't want to use complex analysis we can proceed in 'elementary' way first remembering that...
(1)
... and that conducts to the identity...
(2)
... so that is...
(3)
Kind regards
If we don't want to use complex analysis we can proceed in 'elementary' way first remembering that...
(1)
... and that conducts to the identity...
(2)
... so that is...
(3)
Kind regards