A simple pedulum consisting of a mass M ...

A simple pedulum consisting of a mass M is attached to a string of length L. Its released from an angle `alpha`. A pin is located at a distance `IltL`, below the suspension. If `theta` is the maximum angle which the string makes after hitting the pin, find `cos theta`

`(L cos alpha+l)/(L+l)`

`(Lcos alpha+l)/(L-l)`

`(Lcos alpha-l)/(L-l)`

`(Lcos alpha-l)/(L+l)`

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