ABCD is a rectangular field with AB = a and BC = b. A lamp post of height h at A subtends an angle alpha at P, the middle point of CD and another lamp post of equal heigh at D subtends an angle beta at Q, the middle point of BC. If PQ subtends an angle theta at A, then cot^(2) alpha cot^(2) beta cos^(2) theta = k^(2), where k =

ABCD is a rectangular field with AB = a and BC = b. A lamp post of hei

1.	ABCD is a rectangular field with AB = a and BC = b. A lamp post of height h at A subtends an angle alpha at P, the middle point of CD and another lamp post of equal heigh at D subtends an angle beta at Q, the middle point of BC. If PQ subtends an angle theta at A, then cot^(2) alpha cot^(2) beta cos^(2) theta = k^(2), where k =
Answer» `(a^(2) + B^(2))//2H^(2)` `(a^(2)-b^(2))//2h^(2)` `2h^(2)//(a^(2) + b^(2))` `2(a^(2) + b^(2))H^(2)` ANSWER :A

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