Over a tower AB of height hmt, there is a flag staff BC,AB and BC makes equal angles at a point distant ′d′mt from the foot A of the tower. The height of the flag staff is
A
h(d2+h2)(d2−h2)mt
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B
h(d2−h2)(d2−h2)mt
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C
h(d2−h2)(d2+h2)mt
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D
h(d2+h2)(d2+h2)mt
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