Question

How to calculate it? Please help

Answer 1

\[(\sum_{k=0}^ \infty \dfrac {E_{2k}}{(2k)!} z^{2k})\sum_{m=0}^\infty \dfrac{(-1)^m}{(2m)!}z^{2m}\]

Answer 2

I need find the coefficients of the product only, but first of, I have to know how to calculate it.

Answer 3

hmm can we say that both the series are power series?

Answer 4

yes, it is

Answer 5

are they orthogonal?

Answer 6

No, those are power series of sec z and cos z

Answer 7

the net is so bad at this end. :)

Answer 8

i don't know much about this
this may be helpful- http://prntscr.com/90icsv

Answer 9

Thank you so much. Let me try this.

Answer 10

:) no prblm B)