Aerospace Engineering > GATE 2013 > Vector Calculus
The directional derivative of the function f(x,y)=(x2+xy2)/√5; in the direction a→=2î-4ĵ at (x,y)=(1,1) is
A
-1/√5
B
-2/√5
C
0
D
-1/5

Correct : c

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