A 151515-meter ladder is leaning against a wall. The distance y(t)y(t)y, (, t, )between the top of the ladder and the ground is decreasing at a rate of 666 meters per minute. At a certain instant t_0t 0 t, start subscript, 0, end subscript, the bottom of the ladder is a distance x(t_0)x(t 0 )x, (, t, start subscript, 0, end subscript, )of 121212 meters from the wall. What is the rate of change of the angle \theta(t)θ(t)theta, (, t, )between the ground and the ladder at that instant?