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\int\limits_{-1}^{1} (\pi (\frac{ 12 }{ 7 }-x ^{2})^{2}-(\frac{ 5 }{ 7}x ^{2})^{2}) dx
\int\limits_{-1}^{1} (\pi (\frac{ 12 }{ 7 }-x ^{2})^{2}-(\frac{ 5 }{ 7}x ^{2})^{2}) dx
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