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The angle of elevation of the top of an ...

The angle of elevation of the top of an incomplete vertical pillar at a horizontal distance of 100m from its base is `45^@`. IF the angle of elevation of the top of complete pillar at the same point is to be `60^@` then the height of the incomplete pillar is to be increased by

A

`50 sqrt2 m`

B

`100m`

C

`100(sqrt3-1)m`

D

`100(sqrt3+1)m`

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