1.

A pole is standing at a point O between two milestones at A and B such that the angles of elevation of the top of the pole at A and B are respectively alpha and beta. If the distance between the milestones is half the height of the pole then

Answer»

`2 sin (ALPHA + BETA) = sin alpha sin beta`
`2 sin (alpha + beta) = COS alpha cos beta`
`sin (alpha + beta) = 2 sin alpha sin beta`
`sin (alpha + beta) = 2 cos alpha cos beta`

ANSWER :A


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