$x^2-2x+4\le0$
$\left(2b-3\right)\left(b+7\right)$
$3a^2b-2ab+4ab^2$
$\int\left(x\sin\left(1+x\right)\right)dx$
$-77\cdot1$
$\frac{x^4-2x^2+1}{x+1}$
$05\cdot0+1$
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