Help with text book (vibration)

  • Thread starter MMCS
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  • #1
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HI,

I am studying vibration, came across this in a textbook and can't see the steps taken to substitute e.q 3.5 into 3.3. There is a second derivative x so where does this go, as there is no s^2 either and I can't see how cos was eliminated

Cheers
 

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  • #2
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##cos^{\prime\prime} (y)=- \cos(y)##
 

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