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Tetradecagram

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Trigonometry 4 The Area of a Triangle

Various ways of using trigonometry to determine the area of a triangle.

From playlist Trigonometry

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Trigonometry 5 The Cosine Relationship

A geometrical explanation of the law of cosines.

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Trigonometry 9 The Sum of Cosines.mov

The sum of the cosine of two angles.

From playlist Trigonometry

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