$\int18xedx$

$\left(-\frac{7}{24}\:\right)\:+\:\frac{7}{24}$

$\lim_{x\to\infty}\left(x-ln\left(x^2+x+1\right)\right)$

$\lim_{x\to-\infty}\left(4xsin\left(\frac{1}{x}\right)\right)$

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

$\left(x^n+y^{2n}\right)\left(x^{n-y^{2n}}\right)$

$x^2+11x+12\ge0$