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Let f(1 , Τρ, T3) (x1+x , (x1, x2, T3) E R3, a > 0. For which a is the function f differentiable at 0?

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2 R 3, Functon S Continyo4s awhen - 2 , 2 + 2 ( 2 3 Punstionis differen tiable at (0,0,0) 1f Partia devvative ay is ts at (이이

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