$\sec^2\left(x\right)-6=-4$
$\sqrt{\left(2-2\right)}^2+\left(-2-6\right)^2$
$\int arctan\left(7z\right)dz$
$\frac{4x^2-8x^2}{2x}$
$\int_0^{\frac{\pi}{6}}\left(secx-cosx\right)^2dx$
$\left(1000\right)\left(\frac{2}{10}\right)$
$-0.82+r-0.83r$
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