1. ## 2 Annoying Integrals

Hello, the following two integrals have me ripping my hair out. Help please?

Integral (4x*(sqrt(1-3x))dx)

Integral (x(arcsin(pi/x))dx)

Subtle hints don't work for me. I have tried all the usual tricks such as substitution/integration by parts. The only things I can think of are trig substitutions... help please!

3. Don't bump.

For the first integral, put $\displaystyle u^2=1-3x$ and remember from there you can isolate $\displaystyle x.$

For the second one, integrate by parts, but, since you told us you're stuck, show what you've done.