1. The problem statement, all variables and given/known data The limit of Cos X as x approaches one using the formal definition. Given epsilon values of .1, .001, .00001 2. Relevant equations 3. The attempt at a solution Spent all period in physics calc trying to solve this using the formal definition. Since there is no way to manipulate abs(cosx-.5403)<epsilon I proceeded to make my delta = the epsilon values and plug into the equation. None of the answers were working correctly. Any help would be greatly appreciated because i have a feeling that im missing something here.