unity - Pool game ball path line

I'm using Unity C#. How would I create the effect in my pool game, a line showing the direction of the second (not white) ball after collision. Example:

I need to make the line coming from the ball (second/leftmost)

P.S. I made the other line by using Raycast to find the hit point and set that point last position of line renderer (white ball is a start position for line renderer and it casts the ray)