/pi*cos(x)\ lim |---------| x->-1+\ 3 /
Limit((pi*cos(x))/3, x, -1)
/pi*cos(x)\ lim |---------| x->-1+\ 3 /
pi*cos(1) --------- 3
= 0.565803251610991
/pi*cos(x)\ lim |---------| x->-1-\ 3 /
pi*cos(1) --------- 3
= 0.565803251610991
= 0.565803251610991