$e^xsin\left(y\right)dx+e^xcos\left(y\right)dy=0$

$\frac{5x^2+6x+1}{x+1}$

$\left(2x+sen\:y\right)dx+\left(xcos\:y\right)dy=0$

$\lim_{x\to\infty}\left(\frac{4^x+5^x}{3^x+6^x}\right)$

$\frac{dy}{dx}=\sec\left(\frac{y}{x}\right)+\left(\frac{y}{x}\right)$

$\left(1+\sin u\right)^2$

$2\cot^{2}\theta=5$