$\frac{\left(\tan\:\left(t\right)+\sec\:\left(t\right).\tan\:\left(t\right)\right)}{1+\sec\left(t\right)}$

$\lim_{x\to0}\left(tan\left(8x\right)\right)^x$

$x^2+2x=6$

$e^ysen\left(2x\right)dx+\left(ycosx-e^{2y}cosx\right)dy$

$\frac{dy}{dx}\left(3x^2-6y+y^2=2x-y\right)$

$y+10>17$

$\frac{x^4-9}{x^2+3}$