Integration by substitution

By using a suitable substitution, integrate the following functions with respect to \(x\):

1. \(x\sqrt{x+2}\)
2. \(\frac{\sqrt{x^2-9}}{x}\)
3. \(\frac{1}{\sqrt{9-4x^2}}\)
4. \(\frac{(\ln x)^3+1}{x}\)
5. \(\sqrt{4-x^2}\)