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

$$\frac{6x^3y^4}{8xy}$$

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

$$5\cdot2^2y$$

$$4+1-9$$

$$-8\left(-3z+3\right)-9z$$

$$\lim x\to x\left(\frac{\sqrt[3]{x^3}+3x}{\sqrt{2x^3}}\right)$$