$\lim_{x\to0}\left(\frac{9x^2}{cos\left(x\right)}\right)$
$\left(3m\right)\left(3m-11n\right)$
$\sin\left(n\right)\cdot\cos\left(n\right)$
$7x=3x+24$
$16\sin\left(x\right)=6$
$\int_1^2\left(csc^2\left(-\frac{r}{2}\right)\right)dr$
$w+w+2d$
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