$\int_{-1}^5\left(1+2x\right)dx$

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

$\frac{u^4-2u^2+1}{u^2-u+2}$

$-\left[1+2-3-4-\left(5-6+7\right)+8\right]-9\cdot\left(-10\right)-11$

$\lim_{x\to0}\left(\frac{x^3}{\tan\left(x\right)-x}\right)$

$x^5-8x^4+22x^3-26x^2+21x-18$

$\lim\:_{x\to\:2}\frac{\sqrt{x^2}-3}{\left(x-2\right)^3}\cdot\:\frac{6x+3}{2x-1}$