1. The problem statement, all variables and given/known data I am to find the partial derivatives fxx, fxy, and fyy of f(x,y)= The integral from y squared to the square root of x of cos(t squared) dt Accidentally posted, was editing to get the TEX to work 2. Relevant equations 3. The attempt at a solution All rules of integration I know fail, and attempting to use an integral calculator leads me to a term "Fresnel", which has never before been explained in my class. This leads me to assume I'm not supposed to take the integral; how, then, do I account for sqrt(x) and y^2?