$$\left(-18x^3y^2z^5\right)\cdot\left(6x^3yz^2\right)$$

$$\left(3n+6\right)^2$$

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

$$\int\frac{x^3-3x^2+x-3}{x^4+8x^2+16}dx$$

$$\lim_{x\to-\infty}\left(3xe^{\frac{x}{3}}\right)$$

$$\left(\frac{1}{2}x^2+4y\right)^3$$

$$\int\frac{3x^2-5x-52}{\left(x+2\right)\left(x-3\right)\left(x+5\right)}dx$$