A ship is located 4 miles from a straight shore. The ship has a radar transmitter that rotates 64? rad/min (radians per minute). At t minutes, the beam makes an angle ? with a perpendicular to the shore, and the beam is x miles from the foot of the perpendicular. See Figure 1. How fast is the radar beam moving along the shoreline when the beam makes an angle of 45 with the shore?