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Brendan's questions

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enwiabe:
fix up the tex plz :P

brendan:
oh nvm i solved it

enwiabe:
Um, evaluate partialdf/dx then partialdf/dy. Then take both limits when x -> 0 and y -> 0... show that both limits are equal to 0.

Tada. Are you having trouble evaluating the partial derivatives f_x and f_y? If so, remember it's a pretty involved product/quotient rule qu.

enwiabe:
k cool

brendan:
i used first principles

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