$\frac{x^3+4x^2-5x+8}{x^2-x+1}$

$\left(\cos\left(x\right)\cos\left(y\right)-\tan\left(x\right)\right)dx-\sin\left(x\right)\sin\left(y\right)dy=0$

$\lim_{x\to1}\left(\frac{7}{x^2}\right)$

$\int\left(\frac{e^{9x}}{e^{9x}+2}\right)dx$

$x^3-4x^2-x+4$

$\lim_{x\to\infty}\left(\frac{\frac{sinx}{cos\:x}}{x}\right)$

$\frac{d}{dx}x^2+y^2-12xy=0$