Ex. 6.5 Cubic Bzier approximation of a quarter circle For a unit quarter circle in the first quadrant, a. Identify the four control points for the cubic Bzier approximation of the quarter circle. Hint: the first and the last control points interpolate the two ends of the quarter circle. The two middle points are symmetric with respect to 45 angle and are determined based on c c() = (2/2, 2/2). = b. Find out the maximum discrepancy between the approximated quarter circle and the exact quarter circle.