Assume that an airplane is flying toward you at a constant height, h miles, and at a speed dx dt When the plane is x miles away, what is the rate of change of 0? K tan (0) = h O de h d x dt x2 + h2 dt h d x O dt x2 + h dt de h d x O dt x2 + h2 dt O de h 2 = d x d t x2 + h dt