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Tangent Line is a line that touches a curve at a point without crossing over.
Added 5/1/2016 7:56:57 AM
This answer has been confirmed as correct and helpful.
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A tangent line is a line that just touches a curve at a point, matching the curve's slope there.
(From the Latin tangens touching, like in the word "tangible".)
Added 10/20/2022 12:47:50 AM