Calculus 3 Quiz
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MULTIVARIABLE FUNCTIONS & PARTIAL DERIVATIVES
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Given u(x,y)=x2−y2x2+y2u(x,y) = \frac{x^2 - y^2}{x^2 + y^2} for (x,y)≠(0,0)(x,y) \neq (0,0), at the point (2,2)(2, 2), what is the directional derivative in the direction perpendicular to the gradient vector and pointing into the second quadrant?
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