We verify in a quick Google search: http://www.google.com/search?hl=en&safe=off&q=sin(pi)&aq=f&oq=&aqi=g10 http://www.google.com/search?hl=en&safe=off&q=sin(pi.

We verify in a quick Google search: http://www.google.com/search?hl=en&safe=off&q=sin(pi)&aq=f&oq=&aqi=g10 http://www.google.com/search?hl=en&safe=off&q=sin(pi... that sin(pi) = 0.