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A point executes SHM about a fixed point...

A point executes SHM about a fixed point O. Its distance from O at a certain time is 1cm and 1second later its distance from O is 5cm. After yet another second is distance is again 5cm. Find the time taken for a complete oscillations.

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The correct Answer is:
`(2pi)/(cos^(-1)3//5)`
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