$\lim_{x\to\infty}\left(\frac{x^3-2x^2-1}{x^3-1}\right)$
$15x-15<45-15x$
$\left(y-7x^2y\right)^2$
$-4-\left(4-9+3\right)-15$
$\int\left(\frac{2x-1}{x-1}\right)dx$
$\lim_{x\to\frac{1}{2}}\left(\frac{x\cos\left(\pi x\right)}{e^2-\sqrt{e}}\right)$
$a^{\frac{2}{4}}$
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