$3ydx+\left(xy+5x\right)dy=0$
$\left(a^2+8\right)\left(a^2-7\right)$
$\lim_{x\to0}\:\frac{1-cos3x}{x}$
$16x^2\:+\:72x\:-\:81\:$
$\left(1+\sin\left(x\right)\right)^2-\left(1-\sin\left(x\right)\right)^2$
$5x-2=3$
$\frac{\left(m^{-1}+n^{-1}\right)}{\left(m^{-1}-n^{-1}\right)}$
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