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(Solved): Can Someone Please Give Me An Easy Proof, Just By Using Things You Learn In Calculus 3. Thank U. ...

9. Let f : R² + R be differentiable at (a,b) e R2 and Vf(a,b) + 0. Show that f(a,b) is a normal vector to the tangent at (a,b

Can someone please give me an easy proof, just by using things you learn in calculus 3. thank u.

9. Let f : R² + R be differentiable at (a,b) e R2 and Vf(a,b) + 0. Show that f(a,b) is a normal vector to the tangent at (a,b) of any level curve off that passes through (a,b).


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