## anonymous 5 years ago (logab)(logbc)=logac how to prove its identity? PS: a,b,a next to logs are subscript

1. anonymous

do you know the change of base theorem? $\log_{a} b =( \ln b)/(\ln a)$

2. anonymous

Sorry, I still cannot understand. Could you please explain to me? How can I prove this identity with the base theorem? Thank you.