how can calculate discrete value of $sinc^2x$

Question

how to calculate discrete values of $sinc^2x = sin^2x/x^2$ in general form? what if x is odd (certainly function parameter will not be an integer)? can it be calculated as some coefficients of $\pi$ ? $$ sinc^2(x/2)=\begin{cases} 1 & \text{ if } x= 0\\ 0 & \text{ if } x= \pm 2,\pm 4,\pm 6, ..., 2k+2\\ ? & \text{ if } x= \pm 1,\pm 3,\pm 5, ..., 2k+1 \end{cases} $$

Answer 1

In the following links there are many information about the function $sinc(x)$ and it's values:

Definition of Sinc function (another question with complete answers)

https://en.m.wikipedia.org/wiki/Sinc_function (the wikipedia article)

Hope that's helping you.