$\frac{1}{x^4-8x^2-9}$
$3\left(15\right)$
$-3w^2-3v-7w+4v+7w^2$
$5\left(4-2\right)^2+1^2\left(2^{3-5}\right)^2$
$2t^2-2t+3$
$\left(m^3+8\right)\left(m^3-8\right)$
$\left(-2a+a^2\right)^2$
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