$\lim_{x\to\infty}\left(\sqrt{x^2+x-1}-\sqrt{x^2-2x}\right)$
$\sin^{-1}0.7$
$1253.01+845.21$
$\frac{du}{dx}=e^{9x-u}$
$x^2^n-\frac{1}{9}$
$9+6^2-2\cdot8$
$-78\:+\:-43\:+\:74\:+\:17$
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