If y = cos x, then the nth derivative of y with respect to x is equal to itself if n is a natural number divisible by 4. 9.

Q: having

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A: ∫13dxx-2    =  [ lnx-2 ]13   =  ln|3 - 2| - ln|1 - 2| =  ln |1| - ln |-1|   =  0 - 0  = 0 

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A: We can answer all three subparts as below.

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