$$9 { \left( { x }^{ 2 } -2x+1 \right) }^{ 2 } -16 { \left(9 { x }^{ 2 } +6x+1 \right) }^{ 1 }$$
$9\left(x-1\right)^{4}-\left(12x+4\right)^{2}$
$$9\left(x^{4}-4x^{3}+6x^{2}-4x+1\right)-16\left(9x^{2}+6x+1\right)^{1}$$
$$9x^{4}-36x^{3}+54x^{2}-36x+9-16\left(9x^{2}+6x+1\right)^{1}$$
$$9x^{4}-36x^{3}+54x^{2}-36x+9-16\left(9x^{2}+6x+1\right)$$
$$9x^{4}-36x^{3}+54x^{2}-36x+9-144x^{2}-96x-16$$
$$9x^{4}-36x^{3}-90x^{2}-36x+9-96x-16$$
$$9x^{4}-36x^{3}-90x^{2}-132x+9-16$$
$$9x^{4}-36x^{3}-90x^{2}-132x-7$$
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$9x^{4}-36x^{3}-90x^{2}-132x-7$