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Surveying
While measuring the distance between two points along upgrade with the help of a 20 m chain, the forward end of the chain is shifted forward through a distance
20 (sin θ - 1)
20 (cos θ - 1)
20 (sec θ - 1)
20 (cosec θ - 1).
Correct Answer:
20 (sec θ - 1)
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