$a^2b\cdot\left(-b^3\right)$
$-997-2004$
$7a^2-49ab^2$
$\lim_{x,y\to0}\left(\frac{x^3-x^2y^3}{\left(x^2+y^2\right)^{\frac{3}{2}}}\right)$
$\cos\left(20\right)\sec\left(20\right)$
$s^2+3s=-4$
$\left(2rs\right)^{-\frac{3}{4}}$
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