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鐘面的時間（時和分）

Author:Eduardo Neto, Anthony OR 柯志明

柯志明香港 GeoGebra 學院

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Visualizing the Pythagorean Identity with Sine and Cosine
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Linear Systems + Relationships Between Coefficients and Solutions
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GGB is Awesome!

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DW Calculus June 2015
fractal
Investigate Sine Curve
Triangle Rotation
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Rectangle
Incircle or Inscribed Circle
Pyramid
Square
Matrices

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