arc length formula, need help with integral

[quaint topaz]

Okay so I'm confused on two parts, I don't really understand how they rewrote the inside part and also just how they found the anti-derivative

[restive trench]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with: ```diff
   +close

[quaint topaz]

let me send another pic of the original

I also don't really understand that part how they rewrote the integral

actually

ohh nvm I see they just factored out 1/4p^2 and then split the square root into two parts

still confused on the anti-derivative part though

[quaint topaz]

+close