$2+\left(-2\right)+1\left(-6\right)$

$9v=9$

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

$\lim\:_{x\to\:\:0}\frac{\sqrt{1+xsenx-\sqrt{cos2x}}}{tan^2\left(\frac{x}{2}\right)}$

$e^x\cdot\frac{dy}{dx}-2x=0$

$\int\frac{\sen^{3}x-\sen^{5}x}{\sen^{2}x\cos^{2}x}dx$

$y^2-2-120$