1. The problem statement, all variables and given/known data Evaluate the following limit. lim as x approaches Pi/2 + of etan x. 2. Relevant equations None. 3. The attempt at a solution Well I've graphed this and I know it approaches 0, but I don't know how to actually solve this. And I'm fairly sure I'm not allowed to just substitute a number close to Pi/2, unless thats the only way. Thanks!