1. The problem statement, all variables and given/known data Let f(x)=cos(x^5). By considering the Taylor series for f around 0, compute f^(90)(0). by the way, I don't know how super/sub script works? 2. Relevant equations 3. The attempt at a solution I tried to substitute x^5 into x's Tyler Series form and solve for f^(90)(0), but it gave me a wrong answer.