数学におけるタンジェントとは何ですか?
接線と導関数 (微積分)
接線と円について解説!
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What is the Difference Between The Tangent Line, The Normal Line, and The Secant Line?
Mainstream math academics not only changed "tangent line" definition but also messed it up!
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UPenn Math 103 Tangent Line from Definition
tangent line definition
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Why are Tangent & Secant given their names?
Math 135 Sections 3.1/3.2... Find tangent line using definition of derivative (reciprocal)
Math 135 Sections 3.1/3.2... Find tangent line using definition of derivative (polynomial)