5m Zen
X3 x x4
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X3 x
X3 x x4
x4 x3 x2 x 1 0
x x2 x3 x4 formula
x x2 x3 x4
x x3 1 3 x4
x4 x3 x2 x 1
integrate x3 x x4 1
int x3 x x4 9
simplify x3 x x4
x3 x x4 9
x3 x x4
