GATE Civil Engineering (CE) 2015 Shift 1 Solved Paper

Question : 40 of 65

Marks: +1, -0

The directional derivative of the field

u (x,y,z) = x^{2}−3yz

in the direction of the vector

(i↖{\^} + j↖{\^}−2k↖{\^})

at point

(2,−1,\:4)

is ______.

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