The function sinc(*) is defined as...

(1)

... and, in my opinion, it is a powerful kay to open many 'doors' in the mathematical world. It admits the 'simplest existing' infinite product expansion...

(2)

... and from (2) we can derive many interesting results. As example let suppose to compute the log of the sinc(*). With easy steps we obtain...

(3)

... where is the 'Riemann Zeta Function'. The (3) suggests as alternative way for the computation of the following...

(4)

This is only one of the possibilities that the sinc (*) opens to You ...

Kind regards