$$\left(m+3\right)\left(m+6\right)$$

$$\frac{1-\cot\left(x\right)}{\tan\left(x\right)+1}$$

$$64m^2n^2-4m^2n^2$$

$$\int\frac{1}{2}e^{4x}xdx$$

$$\frac{x+05}{6x-x}$$

$$\int\frac{7x+1}{x^2-x-2}dx$$

$$\int x\left(5+x^4\right)dx$$