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X2 x x3 x2 x 1
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X2 x x3 x2
X2 x x3 x2 x 1
x3 1 x2 4 1 x 1 x 1 x2 x 1
x2 x 2 x3 x2 x 1
let 1 x )( 1 x x2 )( 1 x x2 x3
integrate x2 x x3 x2 x 1
x2 x x3 x2 x 1