Tangent Command

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Tangent[Point, Conic]
Creates (all) tangents through the point to the conic section.
Tangent[Line, Conic]
Creates (all) tangents to the conic section that are parallel to the given line.
Tangent[Number a, Function]
Creates the tangent to the function at x = a.
Tangent[Point A, Function]
Creates the tangent to the function at x = x(A).
Note: x(A) is the x-coordinate of point A.
Tangent[Point, Curve]
Creates the tangent to the curve in the given point.

Note: Also see tool Tangents.

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