1. ## Integral

i need help with these integrals
1. integral from 0 to infinity e^(-ax) cosbx dx
2. integral from 0 to 1 1/sqrt(x(1-x^2))
thanks

2. ## Re: Integral

I'm not sure, beacause I didn't did it, but I have an idea for the second. Let $\displaystyle \sqrt{x}=u$ then you will obtain $\displaystyle$\displaystyle \int \dfrac{1}{\sqrt{1-u^4}} du then by parts will be easy but rather long

3. ## Re: Integral

For the first, use integration by parts twice.