$\frac{dy}{dx}=\left(x^2+1\right)y$
$\lim_{x\to\infty}\frac{x^5}{e^x}$
$7x+5>19$
$\left(x+y\right)=x^2+3x$
$\lim_{x\to0}\cos\left(\frac{\pi}{x}\right)$
$\left(2x\:+\:9\right)\:\left(2x\:-\:9\right)$
$\left(\frac{1}{2}a-\frac{1}{3}b+\frac{1}{4}c\right)^2$
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