$2r^2-3r-20$
$\int\left(-3cscxcotx\right)dx$
$5\cdot7-12-6-5\cdot4-4$
$32n^2-50$
$\left(3+4\right)\left(5+2\right)$
$\frac{\cos\left(x\right)-1}{\sin^2\left(x\right)}$
$5x^2y+3x=2y+6$
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