# How would I integrate the following:

1. Oct 20, 2009

### martinhiggs

1. The problem statement, all variables and given/known data

$$\frac{dz}{d\theta}$$ = $$\int\sqrt{a^{2} + z'^{2}}$$

I think I would have to make a substitution but I'm not sure which one to make...

2. Oct 20, 2009

### tiny-tim

Welcome to PF!

Hi martinhiggs! Welcome to PF!

(have a theta: θ and a square-root: √ and an integral: ∫ )

I'm confused

What is z' ? And what is the d(something) inside the ∫ ?