Prove that is differentiable on R2 for all a f(x, y) = Itx2+y2) (x, y)(0.0) 0
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is differentiable on R2 for all a
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f(x, y) = Itx2+y2)" (x, y)关(0.0) 0
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At any x y 0 0 f has continuous first partials hence is differentiable ...View the full answer
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