1. The problem statement, all variables and given/known data The problem asks me to: Determine a reduction formula for the stated integral (See Picture and problem at: http://garciarussellchem.angelfire.com/Photo/ Please help me out with this problem. I don't understand why they do not include an extra r in the denominator when integrating dv. I also don't understand what purpose the r^(n-1) serves. This is a bit confusing. Thank you.