Fly Line Triangle

Fly Line Triangle
Calculus Question. Please explain the work you show!?

An airplane is flying in a horizontal, straight-line path. The speed of the airplane is 100 meters per second, and its latitude is 1000 meters. What is the rate of change of the angle of elevation, theta, when the horizontal distance from a reference point P on the ground is 2000 meters?

There's also a right triangle included with the problem.

I'm pretty sure this has something to do with definite integration but I don't know where to start.

I think it has to do with differentiation not integration because you're trying to find the "rate of change." Tip: You are given the horinzontal and vertical distance. It is hard to explain it to you here on-line.

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