Suppose that f: R2 R2 has continuous first-order partial derivatives in some ball Br(x0, y0), r >

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Suppose that f: R2 †’ R2 has continuous first-order partial derivatives in some ball Br(x0, y0), r > 0. Prove that if Δf(x0, y0) ‰  0, then
Suppose that f: R2 †’ R2 has continuous first-order partial

and

Suppose that f: R2 †’ R2 has continuous first-order partial
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