$\frac{s^2}{s^3-1}$

$\left(4x^4-8x-1\right)+\left(x-1\right)$

$5x+10x^2$

$\frac{d}{dx}\frac{\csc\left(x\right)\tan\left(x\right)}{\cos\left(x\right)}$

$60+9a^2+1$

$\frac{d}{dx}\left(-x^{-3}\right)$

$\lim_{x\to\infty}\left(\frac{\sin^4\left(x^2+3x+1\right)}{x^2+3x+1}\right)$