4. E and F are vector fields given by E = 2xax + ay + yzaz and F = xyax y^2 ay+ xyzaz. Determine: (a) | E | a t (1, 2, 3) (b) The component of E along Fat (1, 2, 3) (c) A vector perpendicular to both E and F at (0, 1, 3) whose magnitude is unity

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