Section 9-2: Theorem 9-1

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This GeoGebra shows how the angle between the tangent line and the radius of the circle is always 90 degrees no matter how big or small the circle is.

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The Lunch Problem
Animated Ball
Graph of the Trigonometric Functions
Quiz: Average Rate of Change (2)
Kite Properties

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除法
對稱
柱體
圓錐曲線
三角函數

Section 9-2: Theorem 9-1

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