$3x_-3$

$\frac{1-\tan^2\left(x\right)\cdot\cos^2\left(x\right)}{\cos^2\left(x\right)}$

$2x^{2}yz^{6}-3x^{3}y^{3}z+5x^{2}y^{2}z^{2}$

$25\cdot2-2\cdot2+1$

$\int5x\sqrt{2x-3}dx$

$\lim_{x\to0}\left(\frac{sen\left(cos\left(x\right)\right)}{senx}\right)$

$\frac{d}{dx}\left(e^{xy}+\frac{x}{y}=y\right)$