Question 805415
Each numerator and denominator have very easy derivatives.  Try to remember the memory device, {{{(Ho*dHi-Hi*dHo)/(Ho*Ho)}}}.


The "Hi" is for the numerator, and the "Ho" is for the denominator.  
The "d" means, "derivative of...".


Look carefully at the memory expression device, and JUST TRY IT.
Tell if you have trouble.