The curvature
\kappa
of a curve
r(t)
at
t
is given by
\kappa =|(dT)/(ds)|
where
T
is the unit tangent vector and
s
is the arclength parameter. Taking
N
to be the unit normal to the curve, derive the following equation
(dT)/(ds)=\kappa N
can you also explain how to get the final answer or what does it look like