The \( \operatorname{sum} \sum_{r=2}^{\infty} \frac{1}{r^{2}-1} \) is equal to math xmlns=http:/...

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The \( \operatorname{sum} \sum_{r=2}^{\infty} \frac{1}{r^{2}-1} \) is equal to
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn1/mnmo)/momo /momn1/mn/math
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn2/mnmo)/mo/math \( 3 / 4 \)
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn3/mnmo)/mo/math \( 4 / 3 \)
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn4/mnmo)/momo /momiN/mimio/mimin/mimie/mimo /momio/mimif/mimo /momit/mimih/mimie/mimis/mimie/mi/math
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