The angle of elevation of the top of a t...

The angle of elevation of the top of a tower from the top and bottom of a building of height 'a' are `30^@` and `45^@` respectively. If the tower and the building stand at the same level , the height of the tower is

`a(3+sqrt(3))/2`

`a(sqrt(3)+1)`

`asqrt(3)`

`a/(sqrt(3)-1)`

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