$20-\left(-4+2\right)$
$\lim_{x\to13}\left(-\frac{ln\:\left(x-12\right)}{x-13}\right)$
$\sin\left(90.1\right)$
$x^2-16x+172$
$10\ln\left(x+16\right)-8$
$+3\:+\:5\:-\:3\:+\:6\:-\:8\:+\:3\:+\:2\:-\:4$
$\sqrt{9-x=2}$
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