What is the value of sin(θ) if θ is the acute angle between the lines whose equations are px + qy = p + q and p(x - y) + q(x + y) = 2q?

Find the equation of a straight line passing through the points (1, 3) and (-2, 4).

Find the equation of the straight line upon which the length of the perpendicular from the origin is 4√2 units and this perpendicular makes an angle of 75° with the positive direction of the x-axis.