Question

# The curvature of a plane curve y=y(x) is given by the formula \frac{y"(x)}{((1+(y'))^2)^{\frac{3}{2}}} Find all curves for which the curvature is 1 at every point. What are these curves?

Derivatives
$$\frac{y"(x)}{((1+(y'))^2)^{\frac{3}{2}}}$$