1.

PQ and RS are two vertical towers of the same height where S is on the ground Q is above the ground. The line joining the top P and the foot S of the two towers meets the horizontal line through Q at a point A where the angles of elevation of the tops P and R of the two towers are alpha and beta respectively. If AS = a, the height of the towers is

Answer»

`(a SIN (BETA + ALPHA))/(COS beta)`
`(a cos (beta + alpha))/(cos beta)`
`(a sin (beta + alpha))/(sin beta)`
`(a cos (beta + alpha))/(sin beta)`

ANSWER :A


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