$\left(3a^3+4b\right)^2$
$-12+1+\left(-67\right)$
$x2+14x-33$
$5b-2b$
$\left(x+20.1\right)\left(x-3.1\right)$
$tan^2x\left(1+cot^2x\right)=tan^2x+1$
$\left(2-x\right)\left(5-x\right)\left(3-x\right)$
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