oliverkahn Messages 27 Reaction score 2 Thread starter Apr 5, 2020 #1 TL;DR How shall we derive the second equation from first? Which formula to use? where ##A## is a constant.
Gaussian97 Homework Helper Messages 683 Reaction score 412 Apr 5, 2020 #2 Make a Taylor expansion of ##\psi(r+c)## and ##\psi(r-c)## around the point ##c=0##