Posted by Megan on Wednesday, March 28, 2012 at 12:03am.
Evaluate
Tan[(3pi70000pi)/2]

Precalc  Steve, Wednesday, March 28, 2012 at 10:40am
(3pi  70000pi)/2 = 3pi/2  350000pi
so, since it's a multiple of pi away from 3pi/2,
tan[(3pi  70000pi)/2] = tan(3pi/2) = undefined