Compute fa(P) where is a unit vector in the direction of . a) f(x, y) = x² + 2xy + 3y², P = (2,1), v = (1, 1) (Answ: 8√2) b) f(x, y, z) = xy + yz + zx, P = (1,-1,2), v= (1, 1, 1) (Answ: 4√3

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