newton first law   3 videos

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  The Law of Sines

  Trigonometry Basic Trigonometry

  How to define the law of sines.

  law of sines ratios triangles
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  The Law of Cosines

  Trigonometry Basic Trigonometry

  How to define and use the law of cosines.

  law of cosines ratios triangles
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  The Cosine Addition Formulas

  Trigonometry Advanced Trigonometry

  How to derive the cosine of a difference formula.

  the unit circle the law of cosines the distance formula cosine of a difference formula