$\frac{2n}{4n^{-2}}$

$\lim_{x\to0}\left(\frac{-\cos\left(x\right)}{x}\right)$

$4h\:-\:2e^2+\:6;\:h=-2;\:e=\:-1$

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

$\frac{1}{3}a^2-\frac{1}{4}\left(a\right)^2$

$\frac{1}{\:2}\int\:\:x^2\sec\:\left(x^3\right)\tan\:\left(x^3\right)dx$

$f\left(x\right)=\sqrt[3]{2x}$