5.1 Let a eR, v = 4ai - 6j and w=a²i +3j. Determine all nonzero values a, if any, so that is parallel to w. 5.2 Determine the angle between the planes 2x-4y+z=3 and -x+2y+3z=1 The angle must be given in radians and rounded off to 3 decimal places.

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