1. The problem statement, all variables and given/known data Find (∂a/∂x) if x = r*sin(a)*cos(θ), y = r*sin(a)*sin(θ), z =r*cos(a). The equations originally have phi in place of a, but I switched it to a for ease of typing. 2. Relevant equations Chain rule? 3. The attempt at a solution I'm not exactly sure where to start. I tried using the chain rule and differentiating with respect to x but then I just end up with too many unknown and nothing really simplifies. How exactly does one go about solving this problem? Thanks ahead of time for any help.