Find the directional derivative of f(x, y, z) = xy2z3 at P (4, 1, 1) in the direction of Q(0, −7, 9). Duf(4, 1, 1) = Expert Answer 100% (107 ratings) Previous question Next question Get more help
So, the directional derivative is, \[{D_{\vec u}}f\left( {x,y} \right) = \left( { - \frac{1}{2}} \right)\left( {{{\bf{e}}^{xy}} + xy{{\bf{e}}^{xy}}} \right) + \left( {\frac{{\sqrt 3 }}{2}}
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