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

The angle of elevation of the top of a hill from each of the vertices A, B, C of a horizontal triangle is α. The height of the hill is :

A

`1/2 a tan alpha cosec A`

B

`1/2 c tan alpha cosec C `

C

`b tan alpha cosec B`

D

None of these

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The correct Answer is:
A
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