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I have this two variable function: it is 0 in {0,0} while it is (x^3 y^2)/(x^2+Abs(y)^(2a)) elsewhere.

do...given the vector {l1,l2} they are asking me: for which "a" the directional derivative along that vector exist in {0,0}? and when it exist what it is? Despite the fact that i know the background theory i'm unable to do the problem, in particular i'm unable to complete the necessary limit :/