$\left(x\right)\left(13\right)\left(2\right)$
$\left(2x-5\right)\left(x^2+5x+6\right)$
$\frac{\csc\left(x\right)}{\cot\left(x\right)\tan\left(x\right)}=\cos\left(x\right)$
$x^2-2x-4y+5=0$
$237-1036+456-215$
$r^2-8r-12$
$-\left(-5\right)-\left(+11\right)-\left(-1\right)$
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