Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. tangent line; tangential lineGeometry
Wikipedia definition
2. TangentIn geometry, the tangent line (or simply the tangent) to a plane curve at a given point is the straight line that "just touches" the curve at that point—that is, coincides with the curve at that point without crossing to the other side of the curve. More precisely, a straight line is said to be a tangent of a curve y = f(x) at a point x = c on the curve if the line passes through the point (c, f) on the curve and has slope f'(c) where f' is the derivative of f.
Read “Tangent” on English Wikipedia
Read “接線” on Japanese Wikipedia
Read “Tangent” on DBpedia
Other forms
切線 【せっせん】

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