1. The problem statement, all variables and given/known data I'm trying to find da/a to calculate the relative possible error in the radial acceleration. The equation I have to derive from is a = 4π²n²rt ⁻² (it cannot be a = v²/r). I'm not really sure how to find da since it has 3 variables? 2. Relevant equations a = 4π²n²rt ⁻² da/a = ? 3. The attempt at a solution I'm assuming you use the u-substitution method...? Any tips or websites that can help me do this?