$\frac{sinxsec^2x-9sinx}{sinxsecx+3sinx}$
$\left(3m+5n\right)\left(3m-5n\right)$
$\frac{x^3-37x-1}{x-6}$
$\frac{d}{dx}\frac{x^7}{\ln xe^x}$
$s2+7s+6\:$
$-56+4$
$\left(\frac{b^2}{a^3}\right)^4$
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