$y^{'\:}=e^xcos^2y$
$\frac{6}{x-1}=\frac{9}{x+1}$
$\lim_{x\to\infty}\left(\frac{3x}{\sqrt{x^2}}\right)$
$\left(7+t\right)^2$
$9x^3+24x^2+13x+2+3x$
$6z^2-12z$
$121a^2-16$
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