Complex Contour Integrals from integrals from $0 \to 1$

105 Views Asked by At

Evaluate:

$$\int_{0}^{1} \frac{dx}{1 + x^3}$$

The bounds are not from 0 to infinity or from -infinity to infinity etc..

How can we use complex contour integration for this? Thanks

1

There are 1 best solutions below

10
On BEST ANSWER

You could transform the bounds:

$$\int_0^1 \frac{\text{d}x}{1+x^3} \stackrel{\left( x= \frac{1}{t+1}\right)}{=} \int_{0}^{+\infty} \frac{t+1}{(t+1)^3+1}\text{d}t$$

I haven't checked if the latter one is solvable using complex contor integration. But I dont see any reason why it wouldn't.