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Q2Section I (General (compulsory))2 of 145

Directional derivative =∇f⋅v^=\nabla f\cdot\hat v with v^=(12,5)/13\hat v=(12,5)/13

Let f(x,y)=x2+5xy2f(x,y)=x^2+5xy^2, then the directional derivative of ff at the point (−2,1)(-2,1) in the direction of vector v=(12,5)v=(12,5) is:

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