$\left(2a+5b\right)\left(3a+b\right)$
$3x^2+\:15x\:-\:5\:=\:0$
$-3x-2y=18$
$\int12x^4e^xdx$
$\frac{\cot\left(\theta\:\right)-tan\:\left(\theta\:\right)}{cot\left(\theta\:\right)+tan\left(\theta\:\right)}=cos\:\left(2\theta\:\right)$
$\left(m^3-8\right)\left(m^3+12\right)$
$-7\left(-4\right)\left(27\right)$
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