$\lim_{x\to\infty}4x^2$
$\left(31\right)^2-4\left(5\right)\left(-22\right)$
$\sin\left(1+\cot^2\right)$
$\frac{9}{2x}<-3$
$\frac{cos\left(2a\right)+cos\left(2b\right)}{2}$
$9a^2-25b^4$
$\left(3m+4n\right)^4$
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