Consider F and C below. (a) Find a function f such that F = Vf. (b) F(x, y) = (2x, 6y), C is the arc of the parabola x = y² from (4, -2) to (1, 1) f(x, y) = x² + 2y² + C Use part (a) to evaluate -21 JC X F. dr along the given curve C.

Q: (b) Show that: cos(x cos 0) = Jo - 2J₂ cos 20 +2J4 cos 40 +

A: Solution (b):

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