A clock tower stands at the crossing of two roads which point in the north-south and the east-west directions. P, Q, R and S are points on the roads due north, east, south and west respectively, where the angles of elevation of the top of the tower are respectively, α, β, γ and δ. Then $(\frac{PQ}{RS})^2$ is equal to:
Answer & explanation
Correct answer: option 1
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