1.

$\displaystyle \int \frac {x\arcsin (2x)}{\sqrt{1-4x^2}} dx$

i tried using substitution by letting u= $\displaystyle \arcsin (2x) $but got stucked.

2.

Evaluate $\displaystyle \int \sqrt{x} \arctan\sqrt{x} dx$

totally no idea on how to start this.

thanks in advance.