$\left|5\right|+\left|4\right|+\left|3\right|+\left|2\right|+\left|1\right|$

$16a^3+54v^{12}$

$x+4y=7$

$\int_{\ln\left(8\right)}^{\ln\left(20\right)}\left(\frac{4e^{-x}}{\sqrt{1-16e^{-2x}}}\right)dx$

$20+90+51-87$

$\left(3e^2-7x\right)^3$

$\frac{1+\tan\:^2\left(80\right)}{\sec\:2\left(80\right)}=1$