$$\frac{x^{-7}}{x^7}$$

$$\left(3n-2m\right)\left(m+2y\right)$$

$$\left(x-2\right)\left(x+5\right)+\left(x-2\right)\left(x+8\right)$$

$$\frac{d}{dx}\left(y=\left(2x^2+sinx\right)^{4x}\right)$$

$$\tan^{-1}\sqrt{4}$$

$$u^2-u-u^2$$

$$\log_a\left(x\right)+\log_a\left(3\right)=\log_a\left(12\right)$$