The angle of elevation of an electric pole from a point A is 60∘ and from a point B towards the pole on the line joining the foot of the pole to the point is 75∘. If the distance AB=a, then the height of the pole is:
A
a(3+2√3)2
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B
a(4+2√3)
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C
a(2+√3)2
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D
a(2√3−3)2
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