I'm trying to find the following indefinite integrals, but seems they're hard to be simplified into common integrals.
Appreciate if anyone could provide some guidelines!

Q1: <br />
\int x {\arcsin {\frac {2e} {x}}} {\arccos {\frac {x}{2r}}} dx<br />

Q2: <br />
\int \sqrt{1-\frac{4e^2}{x^2}} \arccos {\frac {x}{2r}} dx<br />

Q3: <br />
\int {x^2} {\sqrt{4r^2-x^2}} \arcsin{\frac{2e}{x}} dx<br />

Q4: <br />
\int {\sqrt{x^2-4e^2}}{\sqrt{4r^2-x^2}} dx<br />