$49a^2-28ab+42b^2$
$\left(2-t\right)\left(t-2\right)$
$\frac{x}{x-3}-\frac{2}{3x+4}$
$60a+64\ge80a-92$
$\left(5x+2y+3\right)\left(5x+2y-3\right)$
$\left(sin\left(x\right)-cos\left(x\right)\right)^2+2sin\left(x\right)cos\left(x\right)$
$w^2+12w$
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