$$9g^2+6g-9$$

$$3-2x+2x^2-4x-5+3x^2$$

$$\int\left(\cos\left(a-x\right)\right)dx$$

$$\left(9ab^4+c^5\right)\left(9ab^8-c^5\right)$$

$$4-115$$

$$\left(2a^2+8a-7\right)\left(3a^2-5a-6\right)$$

$$x^2\left(4x+1\right)^4$$