 A vertical tower stands on a horizontal plane and is surmounted by a vertical flagstaff of height h. At a point on the p

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Q 3020578411.     A vertical tower stands on a horizontal plane and is surmounted by a vertical flagstaff of height h. At a point on the plane, the angle of elevation of the bottom of the flagstaff is  \alpha and that of the top of the flagstaff is  \beta  Then the
height of the tower is : A \frac { h }{ \tan { \alpha } }

B \frac { h\tan { \alpha } }{ \tan { \beta } -\tan { \alpha } }

C \frac { \tan { \beta } }{ h }

D \frac { \tan { \alpha } }{ \tan { \beta } -\tan { \alpha } }

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