Can you please help me with the following problem: Given a function of the form f(x,y) = (a-b x)^2 - (c - d y)^2, how can I tell how does f change when (x-y) change?
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Hey Essa. Do you know about directional derivatives?
I'm a little weak on multi-variable calculus, but if g=x-y, can't you just do: $\displaystyle \frac{df}{dg} = \frac{df/dx}{dg/dx} + \frac{df/dy}{dg/dy}$ - Hollywood
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