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PQ is a post of height a, AB is a tower of height h at a distance x from the post, and `alpha and beta` are the angles of elevation of B, at P and Q respectively such that `alpha lt beta` . Then

A

`h = x tan alpha`

B

`h = x sin 2alpha`

C

`h = xcos 2 alpha`

D

`h=x sin alpha`

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The correct Answer is:
A
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