1. The problem statement, all variables and given/known data Given the potential energy function V(x,y)=V(ax-by) where a,b is an arbitrary constants differentiate with respect to x and y. 2. Relevant equations Multivariavle differentiation 3. The attempt at a solution The answer yields (d/dt)p1=-aV'(ax-by) (d/dt)p2=+bV'(ax-by). The right side is confusing. How did it get to that? Im not in my MultiCal class yet as im just in the middle of SingCal so i dont get it. Can you guide through the process?