$$3x\left(5xy\right)$$

$$\left(x-2y+z-3b\right)^2$$

$$\lim_{x\to\infty}\left(\frac{3}{2x-5}\right)$$

$$64x^2y^2-32xy+4$$

$$\int\frac{1}{x^{\frac{1}{2}}\:e^{x^{\frac{1}{2}}}}dx$$

$$\lim_{x,y\to0}\left(\frac{y^6}{x^{10}\cdot\:\:y^2+x^{15}}\right)$$

$$\sqrt[6]{t}-\:\frac{1}{\sqrt[6]{t}}$$