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integrate { π·[ 1 + abs(x^2 - 1) ]^2 - π·[ 1 + abs(x + x^2) ]^2 } dx from x=-1..0
integrate { π·[ 1 + abs(x^2 - 1) ]^2 - π·[ 1 + abs(x + x^2) ]^2 } dx from x=-1..0
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