$\lim_{x\to-1}\left(\frac{3x-9x^2}{2ln\left(-1-2x\right)-2}\right)$

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

$-12x^3y\sqrt{3}+18x^2y^4+27xy^5$

$2\sin\left(x\right)+\sin^2\left(x\right)$

$\frac{\frac{\cos\left(z\right)}{\sin\left(z\right)}+\tan\left(z\right)}{\tan\left(z\right)}=\csc^2\left(z\right)$

$\left(3a^3+5b^4\right)^2$

$22x+121$