GATE (TF) Textile 2009 Question Paper Solution | GATE/2009/TF/26

Question 26 (Textile Engineering & Fibre Science)

The absolute value of the directional derivative of the surface given by \frac{x^2}{1}+\frac{y^2}{4}+\frac{z^2}{9}=3 at P(1,2,3) in the direction of the line OP, where O denotes the original is

(A)\frac{3}{\sqrt{14}}
(B)\frac{\sqrt{14}}{3}
(C)\frac{6}{\sqrt{14}}
(D)\frac{\sqrt{14}}{6}
[Show Answer]

Option C is correct

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