4. (10%) Find the directional derivative of \( f(x, y, z) = 2x^2 + 3y^2 + z^2 \) at point \( P \): (2, 1, 3) in the direction of \( a = [1, 0, -2] \).
阿摩線上測驗
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4. (10%) Find the directional derivative of \( f(x, y, z) = 2x^2 + 3y^2 + z^2 \) at point \( P \): (2, 1, 3) in the direction of \( a = [1, 0, -2] \).