Consider F and C below. F(x, y, z) = yzexzi + exzj + xyexz k, - C: r(t) = (t² + 1)i + (t² − 1)j + (t² - 4t) k, 0≤ t ≤4 (a) Find a function f such that F = Vf. f(x, y, z) = (b) Use part (a) to evaluate [ F. dr along the given curve C.

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