1. The problem statement, all variables and given/known data I am trying to show that the pressure drag acting on a sphere is 2πμaU by integrating around the surface of the sphere where U is the speed of the fluid the sphere is in, a is its radius, and μ is the viscosity. 2. Relevant equations The pressure at a given position r can be written as: P-P0 = -1.5μUacos(Θ)/r2 3. The attempt at a solution I have tried integrating the above equation for Θ from 0 to 2π over the surface of the sphere but my answer is 0 which is clearly not the correct answer. I feel like this should be a fairly easy integration but I do not know how else to go about it. Any suggestions would be greatly appreciated. Thank you!