$-1-6-5r+13r$

$\left(7x^3y^2-4\right)\left(7x^3y^2+7\right)$

$\lim_{x\to1}\left(\frac{5e^{3x}-15}{2cos\left(x\right)-4}\right)$

$\left(8+x\right)\left(360-8x\right)$

$\int\left(2x^3\sqrt{x^2-1}\right)dx$

$200-60-300-\left(-140\right)-\left(-680\right)-\left(-500\right)$

$\int8ze^zdz$