5. Let II be the plane with equation x+y+z= 3, and let II₂ be the plane with equation 3x + 4y + z = 1. (a) Find two distinct vectors normal to II, and one vector normal to II₂. (b) Find a parametric equation of a line which is at right angles to II₁. (c) Find the angle in radians between the planes II and II₂, correct to two decimal places.

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