I just joined the pro in order to see the step-by-step solution of a limit calculation. But after I became Pro and clicked on the step-by-step solution, the site gave me "Step-by-step solution unavailable." So, anyone knows what this means and how to deal with it? Thanks. my query was "limit of ((1+a)(1+1/a)^(2a)-aexp(2))/(exp(2)-(1+1/a)^(2a)) as a goes to +?"