$2\left(3+\cos\left(2x\right)\right)$
$\frac{36x^4-109x^2+25}{3x-5}$
$-2m+6m$
$\frac{d^2}{dr^2}\left(3xy-4y^2\right)$
$\left(8-a+b\right)^2$
$\arcsec\left(16.363636\right)$
$1-\left|7-\left(8+12-4\right)-7\right|-35+\left(4+18-15\right)$
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