$\lim_{x\to-\infty}\left(\frac{3x^4+6x^3}{2x^3+3x}\right)$

$\left(x^2+4x-10\right)\left(x-1\right)$

$\lim_{x\to\pi}\left(\sin\left(7x\right)\csc\left(5x\right)\right)$

$x^2+\frac{1}{3}x$

$w\left(\sqrt{\frac{x}{x-8}}\right)$

$\frac{du}{dr}=\frac{ur+3u-2r-6}{ur+5u-4r-20}$

$\left(w^4g^2\right)^4$