1.

A vertical tower standing at O has marks P, Q, R, S at heights of 1m, 2m, 3m and 4m from the foot O and A is a point on the horizontal plane through O. If PQ and RS subtend angles alpha and beta respectively at A where OA = 2m then cos (alpha + beta) =

Answer»

`5//sqrt(26)`
`24//sqrt(650)`
`23//sqrt(650)`
`1//sqrt(26)`

ANSWER :C


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