Find the angle 𝜃 between the gradient of f(x, y, z) = ze7x + 8y and a unit vector û that will make the directional deriv

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answerhappygod
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Find the angle 𝜃 between the gradient of f(x, y, z) = ze7x + 8y and a unit vector û that will make the directional deriv

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Find the angle 𝜃 between the gradient of f(x, y, z) = ze7x + 8yand a unit vector û that will make the directional derivative of fat P0(1, −1, 3) in the direction of û equal to 70% of the maximumrate of change of f at P0.
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