continuity, derivability, diffentiability

infinity

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Feb 9, 2015
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WP_20150210_003.jpgWP_20150210_004.jpgHi, i'm Italian. Excercise ask me to study continuity, derivability and differentiability in (x,y) = (0,0).
But i can't go on. Please help me. If this post does not respect your rules please tell me.Thank you.
 
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