y= (r2-2r)er
D Deleted member 4993 Guest Mar 24, 2019 #2 retrodisco said: y= (r2-2r)er Click to expand... Have you been taught the following rule: If y = f(x) * g(x) then dy/dx = [df(x)/dx] * g(x) + [dg(x)/dx] * f(x)
retrodisco said: y= (r2-2r)er Click to expand... Have you been taught the following rule: If y = f(x) * g(x) then dy/dx = [df(x)/dx] * g(x) + [dg(x)/dx] * f(x)
Harry_the_cat Elite Member Joined Mar 16, 2016 Messages 3,695 Mar 26, 2019 #4 retrodisco said: what is that rule? Click to expand... the product rule