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Hello! I am confused how to approach this problem. Thank you!! Find the directional derivative of f at P in the direction of a for

Hello! I am confused how to approach this problem. Thank you!!

Find the directional derivative of f at P in the direction of a for f = x2+ 2+ 22, P: (2, 2, -1), a = [1, 1, 3] to 3 decimal places

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