$$1-9 { a }^{ 2 } { b }^{ 4 } { C }^{ 6 } { b }^{ 8 }$$
$\left(-3aC^{3}b^{6}-1\right)\left(3aC^{3}b^{6}-1\right)$
$$-9a^{2}C^{6}b^{12}+1$$
$$\left(1-3ab^{6}C^{3}\right)\left(1+3ab^{6}C^{3}\right)$$
$$\left(-3aC^{3}b^{6}+1\right)\left(3aC^{3}b^{6}+1\right)$$
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$1-9a^{2}C^{6}b^{12}$
