$\lim_{x\to\infty}\left(1-\frac{1}{x}\right)^{\frac{x}{9}}$
$\frac{3x^2}{-x}$
$\left(5z-2\right)\left(7z-6\right)$
$\frac{6a^3b^4}{8a^3}$
$2x^4+x^2+1;\:x=10$
$\frac{dy}{dx}=\frac{x}{y}-\frac{y}{x}-1$
$4\left(44+3\right)$
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