$\left(40-50\right)-\left(-10-2\right)\:+2$
$33-\left(-33\right)$
$\frac{x\:^2-25}{x-5}$
$\log\:\left(x\right)=3\log\:\left(6\right)-2\log\:\left(3\right)$
$\int-40cos\left(5y+4\right)dy$
$cos^2\left(x\right)+cos\left(x\right)$
$\left(3x+2\right)\left(2x-5\right)$
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