- #1

- 30

- 0

## Homework Statement

## Homework Equations

## The Attempt at a Solution

I've been doing Calculus examples using substitution recently, and some are very easy to spot when to make what

*, but sometimes it's not that easy. I'm having trouble determining which equations I should make as*

**u***, and which ones I shouldn't.*

**u**I would greatly appreciate it if I could be given some hints for these problems!

Thanks in advance!