2. Sin, Cos and Tan of Sum and Difference of Two Angles
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![Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]](https://trigidentities.net/wp-content/uploads/2020/06/Law-of-Cosine.png "Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]")
Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]
![Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]](https://trigidentities.net/wp-content/uploads/2020/06/Double-Angle-Formula.png "Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]")
Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]
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