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UPSC NDA II 2011 Mathematics Paper

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Question : 54

Total: 120

A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height h. At a point P on the plane, the angle of elevation of the bottom of the flag staff is β and that of the top is α. What is the height of the tower?

‌
h‌tan‌β
tan‌α−tan‌β
‌
h‌tan‌β
tan‌α+tan‌β
‌
h‌cos‌β
cos‌α−cos‌β
‌
h
cos(α−β)

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