$y+9x+8+x$

$\lim_{x\to1}\left(\frac{1-x}{x^3-2x^2-x+2}\right)$

$\cot^2\left(y\right)\left(1-\sin^2\left(y\right)\right)=\cot\left(y\right)^2-\cos\left(y\right)^2$

$xy'=e^{2y}+xe^{2y}$

$\left(w-8\right)\left(w-9\right)^{\text{tolt}}$

$\frac{dy}{dx}=\frac{-2xy}{y^2-5x^2}$

$9y^4-13y^2+4$