$\left(3ycosx+4xe^x+2x^2e^x\right)dx+\left(3senx+3\right)dy=0$

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

$3x^2-28x+25=8x^2-43x+43$

$\cos\left(\frac{2\pi}{9}\right)\cdot\cos\left(\frac{\pi}{18}\right)+\sin\left(\frac{2\pi}{9}\right)\cdot\sin\left(\frac{\pi}{18}\right)$

$\frac{1\left(2x^2+4x-2\right)}{2}$

$\lim_{x\to\infty}\left(\frac{x-x^5}{x^5-2x+x^2}\right)$

$\frac{dx}{dy}=x+3$