Calculus Cheat Sheet Limits Definitions Precise Definition : We say lim f x ( ) = L if Limit at Infinity : We say lim f x ( ) = L if we xa → x →∞ for every ε > 0 there is a δ > 0 such that can m ake fx ( ) as close to L as we want by whenever 0 < xa. −< δ. t hen . f x ( ) −< L ε. taking . x. l arge enough and positive. “Working ...