October 2018 1 85 Report

Zbadaj monotoniczność ciągu

an=(n^2+2n+1)/(n^2-4)

Doszedłem do tego, że:

an+1=(n^2+4n+4)/(n^2+2n-3)

an+1-an = (-2n^2+12-13)/(n^2+2n-3)(n^2-4)

Nie wiem co dalej


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