See section 12.6.3 for tangents in space.
The tangent command takes as arguments either a curve and a point, or a point defined with element (see section 11.6.14) using a curve and parameter value.
tangent returns and draws the list of lines tangent to the
curve passing through the given point.
Input:
Output:
Input:
Output:
When tangent is called with an element, the tangent will change along with the point on the element.