The expression (a^2+4b^2+4ab+6a+12b+9=?
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a+2+4b+2+4ab+6a+12b+9
a+6a+2+2+9+4b+12b+4ab
7a+13+16b+4ab
a+6a+2+2+9+4b+12b+4ab
7a+13+16b+4ab
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