$5a^2\:-\:3a\:-\:2$

$\frac{dy}{dx}=\frac{2y}{6+x}$

$\cos^2x-3\cos x=-2$

$\lim_{x\to-\infty}e^x\sin\left(x\right)$

$\frac{du}{dt}=e^{2u+3t},u\left(0\right)=-12$

$\frac{dy}{dx}\left(y=\left(1+5x\right)^{\frac{2}{x}}\right)$

$-\:\left\{-2\:-\:\left[-3\:-\:\left(-5\right)\:+1\right]\:-18\right\}$