Ononot — If \nabla f(a,b) = \langle 0, 0 \rangle, what does this impl

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Multivariable & Vectoreasy

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If $\nabla f(a,b) = \langle 0, 0 \rangle$ , what does this imply about the tangent plane to the surface $z = f(x,y)$ at the point $(a, b)$ ?