$$\frac{1}{2}a^2b+\frac{1}{4}a^3b^4-\frac{1}{8}a^2b^5+\frac{1}{16}a^4b^2$$

$$\int_{-4}^0\left(\frac{1}{\sqrt{16-x^2}}\right)dx$$

$$\frac{81x^5}{9x^5}$$

$$\frac{x^2+3x}{x-1}$$

$$\left(x^2+2x+1\right)\left(x^2-4x+3\right)$$

$$\int\frac{\left(5-4u\right)^{\frac{1}{2}}}{2}du$$

$$6\left(y+4\right)=840^3$$