$\log\left(18\right)=\log\left(x^2+9\right)$
$6x^5-48x^2$
$2+9+-2$
$-4+6+-14+7+-42+4$
$41^2$
$\frac{\left(secx-cosx\right)}{1+cosx}$
$-5-3-\left(+8+1\right)$
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