Number 4 show all work please

4) A car travels at speed v around a frictionless curve of radius r that is banked at an angle 0 to the horizontal. Show that the proper angle of banking is given by tan (0) =. (Hint, this is easier if you don't rotate the coordinate system like most other incline problems, and treat the x-axis as the horizontal direction, and the y-axis as the vertical direction. This is because the centripetal force is horinontal.)