Slope and Tangent Lines
Move A. Adjust the tangent line until it just touches. Zoom in and adjust until you think you’ve got it. Show the slope by derivative. How close did you get? Reset, move A or change the function, and try again.
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Trigonometric Ratios of Rotation and Reference Angles的副本
Find the distance between the two lines
Integer addition commutativity - CUEBA0024
Similarity Transformation or Similarity