Answer to Question #66012 in Calculus for devangi

Question #66012

Find the directional derivate of
f(x,y)={2xy/(x^2+y^2), (x,y)≠(0,0) ; 0, (x,y)=(0,0)
at (0,0) in the direction of (i) θ=π/2, (ii) θ=π/4

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