<t>Hi,I guess my answer might sound provocative, but what about mathematica?Input : Limit[(1 - y^2)*y*Log[(1 + y)/(1 - y)]*Log[(1 + y)/(1 - y)], y -> 1]Output : 0This is definitely not a methodological answer, but you'll have your answer in many cases, which will give you a hint of what to look for ...