Maximum error in coefficient of rigidity using partial differentiation

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cowboi12345
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The coefficient of rigidity n of a wire of length 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 that's about it..
 

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