Question: Suppose that V is open in R2, that (a, b) V, and that f: V R is C3 on V. Prove that 2T limo 2.

Suppose that V is open in R2, that (a, b) ˆˆ V, and that f: V †’ R is C3 on V. Prove that
Suppose that V is open in R2, that (a, b)

2T limo 2. f(a + r cost, b+rsin ) cos(20) d = fxx(a , b) _fyy(a,b). r

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