$$\left(5ab^2-2\right)\left(5ab^2+2\right)$$

$$4+8-5+1-12+6$$

$$2x^4+10x^3+12x^2-8x-16$$

$$\frac{d}{dx}\frac{-3x^2+59y}{-59x+3y^2}$$

$$\frac{d}{dx}3x^2-xy^2+y^{-1}$$

$$18+4.24$$