$y^3-z^3$
$-1200xy+900y^2+400x^2$
$\int_{-\frac{x}{4}}^{\frac{x}{6}}\left(-\sec\left(x\right)\tan\left(x\right)\right)dx$
$\left(-9\right)+\left(-3\right)^2$
$\left(7x-1\right)\left(7x+1\right)$
$\lim_{x\to-2}\left(\frac{1}{2}x^3-5x\right)$
$a=2;\:b=7;\:c=10$
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