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## Homework Statement

Find the curvature of a helix given by the parametric equation r(t)=<acost, asint, bt> where a and b are real numbers

## Homework Equations

I know k=|T'(t)/r'(t)|

## The Attempt at a Solution

and I believe the answer to be k=b/(a

^{2}+b

^{2})

^{1/2}, I just don't know how to get there