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Answer on Calculus Question for Rockney Shepheard

Question #24139
I want to find the rate of change of the area of any rectangle with respect to it's hypotenuse. I know how to do derivatives but I don't have any idea what equation to apply it to. Would it be the equation of the area or the hypotenuse I would take a derivative of? Is there a rule in calculus that would make it clear which one to use given (dA/dH), such as..."always take the deriviative of the one on top (dA/dH)? Thanks!
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Comments

Rocky Shepheard
13.02.2013 17:08

But according to KhanAcademy the answer should be
1/2(x^2-a^2)^-1/2 x ((2x-2a)*da/dx)

https://www.khanacademy.org/math/calculus/differential-calculus/implicit_differentiation/v/implicit-derivative-of--x-2-y-2--3---5x-2y-2

What might I be missing?

Assignment Expert
13.02.2013 09:12

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Rocky
12.02.2013 12:35

Thank you. That is precisely the kind of answer I was seeking.

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