[Solution Library] Given f(x,y)=ln √x^2+y^2, find The direction and maximum rate of increase of f(x,y) at (1, 2). The directional derivative of f(x,y)
Question: Given \(f\left( x,y \right)=\ln \sqrt{{{x}^{2}}+{{y}^{2}}}\), find
- The direction and maximum rate of increase of \(f\left( x,y \right)\) at (1, 2).
- The directional derivative of \(f\left( x,y \right)\) at (1, 2) in the direction of the vector (-4, 3)
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