Collect logarithms : lncollect

lncollect takes as argument an expression with logarithms.
lncollect collects the logarithms (rewrites sum of ln as ln of products). It may be a good idea to factor the expression with factor before collecting by lncollect).
Input :

lncollect(ln(x+1)+ln(x-1))

Output :

log((x+1)*(x-1))

Input :

lncollect(exp(ln(x+1)+ln(x-1)))

Output :

(x+1)*(x-1)

Warning!!! For Xcas, log=ln (use log10 for 10-base logarithm).