1.

If two vertical towers PQ and RS of lengths a and b (a gt b) respectively subtend the same angle alpha at a point A on the line joining their feet P and R in the horizontal plane and angles beta and gamma at another point B on this line nearer the towers on the same side of the towers as A, then (sin (beta - gamma))/(sin(beta - alpha)) is equal to

Answer»

`(B SIN ALPHA)/((a-b) sin GAMMA)`
`((b-a)sin gamma)/(b sin alpha)`
`(sin gamma)/(sin alpha)`
`((b-a)sin alpha)/(b sin gamma)`

ANSWER :B


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