$212\cdot222$
$45\cdot104$
$\frac{5x^2+2x-4}{2x+5x^2}$
$\left(x-5\right)^2-10\le3\left|5-x\right|$
$\frac{sin\left(x\right)}{sec\left(x\right)-1}\cdot\frac{sec\left(x\right)+1}{sec\left(x\right)+1}$
$5a+2a^2-10a+7a$
$4x+5<6$
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