[See] Find the derivative of f(x, y)=1+2 x √y at (3,4) in the direction of u=4 i-3
Question: Find the derivative of \(f(x, y)=1+2 x \sqrt{y}\) at \((3,4)\) in the direction of \(\mathbf{u}=4 \mathbf{i}-3 \mathbf{j}\).
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