$\lim_{x\to\frac{\pi}{2}}\left(7\cos\left(3x\right)\sec\left(-5x\right)\right)$
$\int_{-1}^2\left(\frac{10}{x^3}\right)dx$
$\sqrt{x-1+2}$
$2cos^2x=13sinx\:-\:5$
$x-20<50$
$10^3.10^6$
$\int\frac{x^2}{x^3-7x+6}dx$
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