8(a). In what direction from the point (2,3,-1) is the directional derivative of o= x²y³z4 is maximum and what is its ma
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8(a). In what direction from the point (2,3,-1) is the directional derivative of o= x²y³z4 is maximum and what is its ma
8(a). In what direction from the point (2,3,-1) is the directional derivative of o= x²y³z4 is maximum and what is its magnitude? 8(b). If A = 2yzi-x²yj+xz²k, B = x²i+yzj-xyk, find the value of (A.V)B.