$\lim_{x\to8}\left(\left(\frac{x-7-\sqrt{x^2-63}}{x-8}\right)\right)$
$50>x-5$
$\int\frac{x+4}{x^3-x^2-20x}dx$
$3y=-12$
$-7\cdot\left(-1\right)-4\cdot\left(8\right)+1$
$\arccos\left(0.45\right)$
$15-\left(-4\right)-\left(-34\right)$
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