1. The problem statement, all variables and given/known data Pardon me first of all for any mistakes, I study in a French school so I might use incorrect terms I have to find the solutions for the following formula: sin^2 ( x - pi/4 ) = 1 2. Relevant equations None? 3. The attempt at a solution I've mostly only worked with regular sins, not those that are to the power of n.. most of the time i'd isolate everything then do arcsin(...) and so on but I am not sure what to do exactly here.