$$\left(a+1\right)\left(b-1\right)$$

$$\lim_{x\to infinity}\left(xsin\left(\frac{2pi}{x}\right)\right)$$

$$\int\frac{2x-3}{x\left(x^2+10\right)}dx$$

$$\sqrt[6]{9^6}.\:3^{12}$$

$$\frac{2}{3}x^3+15x^2+\frac{1}{6}x^3-19x^2-10$$

$$\left(2c\right)^{-2}$$

$$\left(2x+5\right)+\left(2x-y\right)$$