Posted by **Bob** on Wednesday, February 22, 2012 at 9:44pm.

Suppose (x^2)*(e^(-2y))= ln(xy)

Find dy/dx by implicit differentiation.

- Math/Calculus. -
**Reiny**, Wednesday, February 22, 2012 at 9:59pm
2x(e^(-2y) ) + x^2(e^(-2y) )(-2dy/dx)= 1/(xy) (xdy/dx + y)

2x e^(-2y) -2y x^2 e^(-2y) = (1/y) dy/dx + 1/x

2x e^(-2y) - 1/x = dy/dx (1/y + 2x^2 e(-2y) )

dy/dx = ( 2x e^(-2y) - 1/x ) / ((1/y + 2x^2 e(-2y)) )

still pretty messy looking, I don't know how far you have to take it.

Also, you better check my work. It is always harder to just type it here, rather than do it on paper.

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