# Partial differentiation question?

1. Jul 24, 2011

### cowboi12345

The coefficient of rigidity n of a wire of lenght L and uniform diameter is given by:
n = AL/d^4

where A is a constant....If errors of +- 0.25% and +-1% are possible in measuring L and d respectively, find the maximum possible error in the calculated value of n...

how do i do this.?

I've partially differentiated it with respect to L and d.....and thats about it..

2. Jul 24, 2011

### cowboi12345

ok...nvm...i got it....its +-4.25%...i forgot to include the units of 0.25L and 1d.....lol...