$$\cos^2\left(x\right)\cos^2\left(x\right)$$

$$\int x\left(x^2-1\right)^2\:dx$$

$$\frac{3}{4}x^4+12x^3+\frac{1}{8}x^4-17x^3-19$$

$$74\cdot83$$

$$\int\frac{-138x}{\sqrt{9+\:x^2}}dx$$

$$a=x^2y+y$$

$$x^5-x^4+x$$