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Homework Help: maths --plse help me..

Posted by Meenakshi on Thursday, December 13, 2012 at 12:22pm.

The angle of elevation of the top of a tower as observed from a point on the ground is alpha and on moving a meters towards the tower, the angle of elevation is beta .prove that the height of the tower is a (tan alpha*tan beta)/(tan beta - tan alpha)

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