$-14\:-\:6\:-\:\left(-2\right)$

$\frac{dy}{dx}=y\left(xy^5+4\right)$

$\int x\left(2t^2-1\right)^2dx$

$\lim_{x\to0}\left(\frac{x\left(e^{-\frac{s}{x}}-1\right)}{s}\right)$

$\int\left(x^2+4\right)^2\left(4x\right)dx$

$\int_{\frac{\pi}{8}}^{\frac{\pi}{4}}\frac{\tan\left(2x\right)}{\cos^2\left(2x\right)}dx$

$\left(\frac{1}{2}a^3\cdot\frac{1}{2}\right)^2$