Your second line is wrong. Given your second line, your third and fourth lines are correct.Originally Posted by NeF
Since you've evidently got the rules right, I'll let you finish it.
It's not entirely clear what you are asking, but here I will assume thatOriginally Posted by NeF
you want the derivative of:
First divide through on the right hand side by the at the bottom:
Now differentiate using the rules for differentiating powers:
Now rearrange and simplify (back towards something like the form we started