$\frac{12+12\cos\left(2\right)}{19\sin\left(2\right)}$

$\frac{2x^2+19x+36}{x+7}$

$\lim\:_{x\to\:\infty\:\:}\frac{\left(\sqrt{2x^2+x}+2x-3\right)}{\left(\sqrt{9x^2+2x+1}\right)}$

$10y^2-7y^2-y^2+2y^2+4y^2$

$\frac{y^2+1}{y^2}\:\frac{dy}{dx}=\frac{1}{x^2+1}$

$a+b+a-b-2a-b$

$\frac{-21x^8y^2}{-3y^5y^22}$