$\lim_{x\to-\infty}\left(\frac{ln\left(x^4-3\right)}{13x+5}\right)$

$a^2+2a-3$

$\left(5x+11\right)\left(5x-7\right)$

$\tan\left(x\right)=\frac{2\tan\left(x\right)}{2-\sec\left(x\right)^2}$

$9y\:-\:2x\:+\:4y\:+\:11x\:-\:3x$

$\left(-\sqrt{x-3}\right)\left(\sqrt{x+3}\right)$

$\lim_{n\to\infty}\left(\left(ln\left(n+1\right)\right)^3\left(ln\left(n+1\right)+4\right)\right)$