Trigonometry: Sine, Cosine and Tan Functions
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This video shows a brief introduction to the wonderful world of trigonometry and defines the functions Sine, Cosine and Tan. Also, how to determine what reference angles to use when inputting to a calculator are shown and an easy way to remember when the ratios of Sine, Cosine and Tan are positive and negative is shown. That method is called A.S.T.C. or All Students Take Calculus.
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Introduction to Trigonometry
Sine, Cosine, and Tan Functions

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