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Question - Heights and Distances - Angle of Elevation, Angle of Depression

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ConceptHeights and Distances - Angle of Elevation, Angle of Depression  

Question

The elevation of a tower at a station A due north of it is α and at a station B due west of A is β. Prove that the height of the tower is `\frac{AB\sin \alpha \sin \beta }{\sqrt{\sin^{2}\alpha -\sin ^{2}\beta `

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