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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 |
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Answer» `(a SIN (BETA + ALPHA))/(COS beta)` |
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