$\frac{d}{dx}\:c=0$

$\frac{2}{3}x^2y^3+\frac{1}{3}x^2y^2+\frac{8}{3}x^2y^2$

$\frac{2}{3}x-\frac{1}{2}=x\:\frac{3}{4}$

$\frac{2sen^2\theta\:+3sen\theta\:-2}{sen\theta\:+2}$

$25t^2-104t+116$

$\int\frac{-4}{\left(x-1\right)^2}dx$

$\int_{-5}^{-3}\left(-\frac{1}{3x-2}\right)dx$