$$\lim_{x\to infinity}\left(\frac{x^2}{\sqrt[3]{x^6+x^2}}\right)$$

$$\int\left(r^2e^{-3r}\right)dr$$

$$23-18+\left(-12\right)-\left(-9\right)$$

$$\left(-2\right)\cdot\left(+7\right)+\left(+5\right)\cdot\left(+6\right)$$

$$\frac{2x}{3}\cdot\frac{5}{y}$$

$$\:\:\sqrt{\frac{9}{16}}x^4y^8z^{12}$$

$$c^2y^2=x\left(x-a\right)^3$$