/pi*x\ lim cos|----| x->-1+ \ 2 /
Limit(cos((pi*x)/2), x, -1)
0
= -2.98142317035981e-32
/pi*x\ lim cos|----| x->-1- \ 2 /
= 2.98142317035981e-32
-2.98142317035981e-32