3. Find the acute angle between the lines. x - 1 3 - y z+5 (a) l1: 3 (b) l1: r = 7 – 2t, y = 4+3t, z = 5t %3D %3D 1 2 I - 1 l2: z+5 l2: x = -1+4s, y = 3+4s, z = 1+s. -2

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