consider the lines l1 : ⟨2 −4t, 1 3t, 2t⟩ and l2 : ⟨s 5, s −3, 2 −4s⟩. (a) show that the lines intersect. (b) find an equation for the the plane which contains both lines. (c) [c] find the acute angle between the lines. give the exact value of the angle, and then use a calculator to approximate the angle to 3 decimal places.