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An aircraft (at Z) is spotted by two observers (at X and Y) who are L=1000feet apart. As the airplane passes over the line joining

An aircraft (at Z) is spotted by two observers (at X and Y) who are L=1000feet apart. As the airplane passes over the line joining them, each observer takes a sighting of the angle of elevation to the plane, as indicated in the figure. If A=50, and B=35, how high is the airplane?

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