$3a^2+12a-15$
$49y^2x^2-28xyz+4x^2$
$0.35^2$
$\lim_{x,y\to0,0}\left(\frac{x^{\:2}-y^2}{x^{\:2}+y^2}\right)$
$\sin\left(90\right)\cdot\cos\left(b\right)+\cos\left(90\right)\cdot\sin\left(b\right)$
$\frac{d}{dx}\sin5x^2$
$\left(8-sqrt\left(7i\right)\right)^3$
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