$\int_{-\infty}^4\left(\frac{2x}{x^2-1}\right)dx$

$\left(\frac{32}{4}\right)^{-1}$

$\lim_{x\to\infty}\left(\frac{\left(x-x\sqrt{x}\right)}{\left(2\sqrt[3]{x^2}\right)+2x-5}\right)$

$\frac{x^2-y^2}{x^2+xy}$

$9\:.\:\left(-\:1\right)\:-\:2$

$\int\frac{1}{t^{\frac{7}{4}}}dt$

$\frac{d}{dx}\left(x\cos\left(y\right)-y\sin\left(x\right)=\pi^4\right)$