$$\int\frac{1}{x^2+4x+8}dx$$

$$6\frac{\sqrt{5}}{\sqrt{5}}\cdot2\frac{\sqrt{5}}{\sqrt{5}}$$

$$\left(8-11\right)-\left(3+1-4-6\right)$$

$$\int5\left(x-3\right)\left(2x-1\right)dx$$

$$\left(13\right)\left(27\right)\left(-7\right)$$

$$x^2-\frac{2}{9}x$$

$$\lim_{x\to0}\left(\frac{1-e^{2x}}{x^3+2x}\right)$$