$-2w=-20$

$\left(14\:-\:2\right)\left\{3+6\right\}\left\{2\cdot3\right\}$

$-\frac{1}{2}e^{-2}x^2+\frac{1}{4}\left(-2e^{-2x}x-e^{-2x}\right)$

$f\left(x\right)=2700\sqrt{5}+900$

$x^2-1>\frac{3}{4}$

$\lim_{x\to0}\left(xtan\left(\frac{2}{x}\right)\right)$

$\frac{\tan\left(x\right)-\tan\left(x\right)^2}{\sec\left(x\right)^2}$