$\lim_{x\to\infty}\left(\frac{2^{-x}}{x^2+1}\right)$
$8^2-15$
$4\frac{dy}{dx}-12xy-3x=0$
$4x^2=144$
$-5\left(a\:-\:6\right)\:+\:2a$
$4\left(4c+5\right)+4$
$\left|-21+\left(-45\right)\right|$
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