$$3x^4\left(4x^{\:3}-5x^2\right)$$

$$\frac{x^2-4b^2}{x+2b}$$

$$4-x<x+10$$

$$-3\left(-4\right)+\left(2-2^3\right)^2$$

$$9x^2-15x$$

$$\int\frac{b^3+14b^2+2}{4b^4+b^3-7b^2+2b}dx$$

$$\int\ln\left(5x^7\right)dx$$