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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 eof the verticles A,B,C of a horizontal triangle is `alpha`. The height of the hill is

A

`(1)/(2) b tan alpha sec B`

B

`(1)/(2) b tan alpha cosec A`

C

`(1)/(2) c tan alpha sin C`

D

`(1)/(2) a tan alpha cosec A`

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The correct Answer is:
D
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