Using the Cosine Rule to Calculate an Angle - YouTube
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Summary of trigonometric formulas
Cosine Calculator - Calculate cos(x) - Inch Calculator
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Triangle Calculator - shows all steps
Writing the Equation of a Cosine Function Given Properties of the Function | Trigonometry | Study.com
3 Ways to Use the Cosine Rule - wikiHow
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![Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]](https://trigidentities.net/wp-content/uploads/2020/06/Screenshot-2020-06-03-at-6.49.12-PM.png "Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]")
Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]
Trigonometric functions - Wikipedia
Sine, Cosine, Tangent
