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The shadow of a tower , when the angle o...

The shadow of a tower , when the angle of elevation of the sum is `30^(@)` is found to be 10 metre longer than when it was `60^(@)` .The height of the tower will be :

A

`5sqrt(3)m`

B

`5(sqrt(3)-1)m`

C

`5(sqrt(3)+1)m`

D

`3sqrt(5)`m

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