How do you integrate the following questions?

[jkh4]

How do you integrate the following questions?

1) x/((3-x^4)^(1/2))*dx

2) (1+e^x)/(1-e^x)*dx

3) (xlnx)/((x^2-1)^(1/2))*dx

thank you so much!

 

[courtrigrad]

1. Set $$x^{2} = \sqrt{3}\sin \theta$$2. Divide it and get $$\int 1 + \frac{2e^{x}}{1-e^{x}} dx$$
3. Use integration by parts.