Daily Equation #10 - Sinc Function - y = a*sin(b*x)/(b*x)

This is Day 10 of my collection of printable equations. To see the whole collection, go to: http://www.thingiverse.com/thing:227210

Based on gregsmith_to's request in the comments, (http://www.thingiverse.com/thing:227223/#comments), for today's equation, I'm doing the Sinc function, y = a*sin(b*x)/(b*x), which is used in signal processing (see http://en.wikipedia.org/wiki/Sinc_function). I've uploaded two different versions of the equation, with different ranges. Per another request, I've i