/ -x \ lim \-1 + 2 *log(1 + 3*x)/ x->0+
Limit(-1 + 2^(-x)*log(1 + 3*x), x, 0)
-1
= -1
/ -x \ lim \-1 + 2 *log(1 + 3*x)/ x->0-
-1.0