$$\int\left(\frac{x^3}{5+4x^2}\right)dx$$

$$\int sin^2\left(9x\right)\cdot\cos^3\left(9x\right)dx$$

$$\int\left(1+\sqrt[2]{\tan\left(x\right)}\right)^2\sec^2\left(x\right)dx$$

$$\frac{\left(3x\right)^3}{a^3}+\frac{3a\left(3x\right)^2}{a^2}+\frac{9xa^2}{a}+a^3$$

$$\left(3a+2b+4\right)+\left(6b+4c-5\right)+\left(a-b-4c\right)$$

$$3n^2+4n$$

$$2x^2-x+8x^2+2x$$