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Show that the function f(x, y) = xy - 8y² is differentiable by finding values of x and y that satisfy this definition.

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Answer:

rentiable?

If the function involves a fraction with variables in the denominator, check to see if the denominator equals zero for any value of x. If it does, ensure the function does not go to + or - infinity there. If it does then the curve is not differentiable at that value of x.