$\left(-7a^5c^2\right)\left(2a^4bc\right)$
$\left(1+r-t\right)^2$
$100-60y^3+9y^6$
$x^2+8x+18=0$
$144x^2-169y^2$
$\lim_{x\to0}\left(\frac{3x^2}{cos\:x-1}\right)$
$x\cdot y'+y=y^2\$
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