1. The problem statement, all variables and given/known data I'm not sure what I'm doing wrong here. 2. Relevant equations f(t) = t/(t+1)2 find f(1/t) 3. The attempt at a solution f(1/t) = 1/(t/(t+1)2) = ((t+1)2)/t = (t2 + 2t +1)/t The answer in my book says it's t/(t+1)2, the original function. Is this an error?