/ 2*x \ lim atan|-----| x->-3+ \3 + x/
Limit(atan((2*x)/(3 + x)), x, -3)
-pi ---- 2
= -1.5707963267949
/ 2*x \ lim atan|-----| x->-3- \3 + x/
pi -- 2
= 1.5707963267949
-1.5707963267949