 
 
 
18.2.1  Curvature of a curve
The curvature
command finds the curvature of a curve.
The curve can be given as an object or by a parameterization.
- 
To find the curvature from a parameterization,
curvature takes two mandatory arguments and one
optional argument:
- 
C, a curve.
- t, the parameter of the curve.
- Optionally, t0, a value of the parameter.
 
- curvature(C,t ⟨,t0⟩) returns the
curvature of the curve; if t0 is
given, the curvature is given at the point it specifies, otherwise
the curvature is given as a function of the parameter.
- To find the curvature from a curve object,
curvature takes two arguments:
- 
C, a curve.
- p, a point on the curve.
 
- curvature(C,p) returns the curvature of C at the
point p.
Examples
| trigsimplify(curvature([5*cos(t),5*sin(t)],t)) | 
| trigsimplify(curvature([2*cos(t),3*sin(t)],t)) | 
|  | | |  | |  |  |  |  | | 260 cos | ⎛ ⎝
 | 2 t | ⎞ ⎠
 | +25 cos | ⎛ ⎝
 | 4 t | ⎞ ⎠
 | +363 | 
 | 
 | 
 |  |  |  |  |  |  |  |  |  |  | 
 | 
| curvature([2*cos(t),3*sin(t)],t,pi/2) | 
| curvature(plot(x^2),point(1,1)) | 
(see Section 19.2.3 and Section 26.5.2.)
 
 
