Please solve 1,2,3 and 4 with fully explaination.

1. Calculate the angle formed by the intersection of the lines L1: r=('|,0,3)+t(1, Determine the angle between the planes x + 2y - 32 - 4 = O and X + 2y - 1 = I a. Determine the angle between the planes x + 2y - 32 - 4 = O and x + 2y - 1:0. b. Determine the Cartesian equation of the plane that passes through the x 3 _ y+1 _ 3+4 2 3 1 point P (1, 2, 1) and is perpendicular to the line a. What is the value of k that makes the planes 4x + ky - 22 + 1 = 0 and 2x + 4y - z + 4 = 0 parallel? b. What is the value of k that makes these two planes perpendicular? c. Can these two planes ever be coincident? Explain