$\frac{125x^4+32x^3+16x-1}{12x^3+6x^2+2x}$

$2+\left|-3\right|+-3$

$\left(1-5ax\right)\left(1+5ax\right)$

$\cos\left(x+40\right)=0.259$

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

$\lim_{x\to0}\left(\frac{2^x-3^x}{4^x-1}\right)$

$\frac{dy}{dx}=-\frac{xy}{e^{-x^2}\left(y^2+1\right)}$