$$\frac{4s^{-5}}{7s^3}$$

$$\frac{d}{dx}\left(\sqrt{x-y}\right)$$

$$\frac{-6x^2+8x+1}{9x^2-12x+4}$$

$$0.35\:-\:0.15$$

$$x^8-x^8$$

$$\frac{d}{dx}\left(sin\left(xy\right)=x\left(lnx\right)^2+2y\right)$$