$$y+7y-15$$

$$\int\left(e^x\sqrt{a-be}\right)dx$$

$$\int15x^2dx$$

$$\int\left(\sqrt{x}-3\right)\left(\sqrt{x}+1\right)^{-1}dx$$

$$\left(0\right)^{-2}$$

$$\left(\frac{4}{12}\right)+\left(-\frac{4}{12}\right)$$

$$\int_0^{\sqrt{4-x^2}}\left(y^2x\right)dy$$