The angle of elevation of a cloud from a point gamma meters above a lake is alpha and the angle of depression of ours reflection in the lake is beta, prove that the distance of the cloud from the point of observation is -
2 \gamma \sec( \alpha ) \div \tan( \beta ) - \tan( \alpha )2γsec(α)÷tan(β)−tan(α)
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https://www.zigya.com/study/book?class=10&board=mbose&subject=Mathematics&book=Mathematics&chapter=Some%20Applications%20of%20Trigonometry&q_type=&q_topic=&question_id=MAEN10049695
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