integral of (Sin(x)/x)^2

Questions
1

What is the most easiest way to solve the integral (sin(x)/x)^2 with limits from -infinity to infinity.

(sin(x)/x)^2 is the “squared Sinc(x)” function

2

Pedantically speaking, you want the following (note that Sin/x really has a discontinuity at x=0, but Sinc doesn’t):

Integrate[Sinc[x]^2, {x, -Infinity, Infinity}]
(* Pi *)

This also works, but technically it’s not the same:

Integrate[(Sin[x]/x)^2, {x, -Infinity, Infinity}]
(* Pi *)