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In a vertical circle, AB is the horizont...

In a vertical circle, AB is the horizontal diameter Let AD and AE are two cords of the circle which subtend the angel `theta` and `2theta` at the centre of the circle respectively. If a particle slides along the two cords from A to D and A to E and the ratio of the time durations it take to travel the distances AD and AE is `1:n` then prove that :
`(n^(2)-1) costheta =1`

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