From a point on the ground the angle of elevation of top of a tower is α. On moving 'a' meter towards the tower, the elevation changes to β. The height of the tower is:
A
tanβ−tanαatanαtanβ
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B
a(tanβ−tanα)tanαtanβ
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C
atanα−tanβtanα−tanβ
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D
atanαtanβtanβ−tanα
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