$1+\tan^2\infty=\frac{1}{\cos^2\infty}$
$x^2-4x-26$
$x^2-5x-14\le0$
$2+4+6+12+24$
$\int\frac{x}{\left(4x-3\right)^2}dx$
$\lim_{x\to0}\frac{e^{3x}-1}{x^3}$
$2a-2a$
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