$$\int\frac{x^3}{\sqrt{4x^2-81}}dx$$

$$\left(7-3\right)\left(4+4\right)$$

$$\cos\left(2x^2+2\right)$$

$$\int\frac{lnx}{8x^3}dx$$

$$\frac{dx}{dm}=\frac{1}{m^2-3m+2}$$

$$\sqrt[3]{e^{3x}}$$

$$4xyz^4\left(-6x^4y^3z^2+2xy^5\right)$$