Ques: A function f : R^2 -> R is defined by f(x,y) = xy. Let V =(1,2) and a = (a1,a2) be two elements of R^2. The directional derivative of f in the direction of v at a is
1. a1 + 2a2
2. a2 + 2a1
3. a2/2 + a1
4. a1/2 +a2
Solution:
1. a1 + 2a2
2. a2 + 2a1
3. a2/2 + a1
4. a1/2 +a2
Solution:
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