$\sec\left(x\right)^2+\sin\left(x\right)^2$
$\left|-281+-393\right|$
$x-2\le4x-5$
$1-2x-x^2=0$
$\left(m-3\right)\left(n+5\right)$
$\sqrt{5}ab^7\sqrt{10}a^3b^3$
$2\cdot\left(1-3\cdot\left(2-1\right)\right)$
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