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One rope of a swing is fixed above the o...

One rope of a swing is fixed above the other rope by b. The distance between the poles of the swing is a. The lengths `l_(1)` and `l_(2)` of the ropes are such that `l_(1)^(2) + l_(2)^(2) = a^(2) + b^(2)` (Fig ).
Determine the period T of small oscillations of the swing, neglecting the height of the swinging person in comparison with the above lengths.

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