simplify a^2 b^2 ( a+2b ) ( 3a + b )
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a^2 b^2 (a+2b)(3a+b)
a^2 b^2 ( 3a^2 + 7ab+2b^2)
3a^4 b^2 + 7 a^3 b^3 + 2a^2 b^4
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