$$\frac{b^2-1}{b^2+2b+1}$$

$$\int\ln\left(v\right)\cos\left(2v\right)dv$$

$$\int\frac{\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)}{-2}dx$$

$$\sqrt{2x}+\sqrt{3}$$

$$\int6e^{x+2y}dy$$

$$\frac{31}{45}x^{-1}.\:\frac{2}{1}$$