How would I integrate the following:

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Homework Statement



\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...
 
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Hi martinhiggs! Welcome to PF! :smile:

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

I'm confused :redface: …

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

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