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Calculate the directional derivative at point p in the direction a. 1) f (x, y) =...

Calculate the directional derivative at point p in the direction a.
1) f (x, y) = (x ^ 2)*(y); p = (1,2); a ⃗ = 3i-4j
2) f (x, y, z) = (x ^ 3)*(y) - (y ^ 2)*(z ^ 2); p = (- 2,1,3); a ⃗ = i-2j + 2k
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