Oh thank you XD

I was also wondering could I please get help with these two questions? I just started learning about the chain rule but I'm still unsure how to use it.

Let me show you the first one as an example, then have another tackle of the second! They are identical in approach

So we know by the chain rule that:

The \(du\)'s sort of cancel each other out like they would regular numbers! So we just substitute the derivatives:

The only difference with the second one is that you'll end up with both an \(s\) and a \(t\) in your answer - Anywhere you see \(s\), replace it with \(2t+1\) according to the equation you are given. Give it a try!