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A particle moves from rest at A on the s...

A particle moves from rest at A on the surface of a smooth circular cylinder of radius r as shown. At B it leaves the cylinder. The equation relating `alpha` and `beta` is

A

`3sinalpha=2cosbeta`

B

`2sinalpha=3cosbeta`

C

`3sinbeta=2cosalpha`

D

`2sinbeta=3cosalpha`

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