Question
5. (1pt) Let f: R² → R be differentiable at a € R². Let (e₁, e2) be the standard bases of R2. Suppose that f'(a; 2e1 + 3e2) = 1 and f'(a; e₁ + ₂) = 1. (a) Find the set of all points (s, t) such that f'(a; se₁ + te₂) = 6. (b) Calculate Vf(a).
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