$\frac{1-cos\left(x\right)}{1+cos\left(x\right)}\left(\cot\left(x\right)-\csc\left(x\right)\right)^2$

$\int_{-1}^8\left(\frac{x+\sqrt[3]{x}}{x^3}\right)dx$

$\frac{3x^2-5x}{2}$

$5+\left(-2\right)-\left(-4\right)+15+\left(-2\right)-\left(-8\right)$

$30\cdot2+19\cdot2+15\cdot2+40\cdot2+5\cdot2+14\cdot2$

$\frac{x^5-x^8}{1+x^2}$

$18x^2+24x^3$