$$5\left(9-3\right)-\left(3\right)\left(4-12\right)$$

$$2a^2b-3ab$$

$$\int_{-2}^{-1}\left(\frac{xe^x+1}{x}\right)dx$$

$$35-91+11+61-72+13+54-27$$

$$\int\:\:cos^9\left(8x\right)dx$$

$$\left(y\cdot2y^3\cdot y\right)^2$$

$$\int\frac{2}{\left(6-x\right)^{\frac{2}{3}}}dx$$