$$\sqrt{\left(x^2+2\right)\left(x^2-1\right)+6}$$

$$-142-893$$

$$\left(\frac{3x^2y^3}{2fg}\right)^2$$

$$\left(5a^2b-3a^3b^2\right)\left(5a^2b+3a^3b^2\right)$$

$$12\cdot25$$

$$25x^2-40x$$

$$\int4x^4\sqrt{2x^5-7}dx$$