$\frac{45x^2-17x-48}{14x^3-5x^2-24x}$

$\int\frac{2x^3-1}{-x\left(x^3+1\right)}dx$

$\lim_{x\to2}\left(\frac{\tan^2\left(x\right)}{x^2-4}\right)$

$-4\left(2\right)\left(-30\right)$

$\cot\left(x\right)\tan\left(x\right)+\cot\left(x\right)=\csc\left(x\right)^2$

$-2x^2+16x+20$

$-5x+2-5x-2$