| Q. | The directional derivative of the function f (x, y) = x2 + y2 along a line directed from (0,0) to (1,1), evaluated at the point x = 1, y = 1 is | |||
| (A) √2 | (B) 2 | (C) 2√2 | (D) 4√2 | |
Ans: 2√2
Sol:
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