$$\frac{d}{dx}\left(2x^3\tanh\left(\frac{1}{x^2}\right)\right)$$

$$\frac{d}{dx}\left(\ln\left(\mathrm{sech}\left(3x+8\right)\right)\right)$$

$$\frac{d}{dx}\left(x\sqrt{x^2-1}\right)$$

$$\frac{d}{dx}\left(2x+1\right)^3$$

$$4x^2-12x+9$$

$$x^2-24x+144$$

$$16x^2-40x+25$$