Sum and Difference Formulas

How to use the Sum and Difference Formulas to find the exact value of the sine, cosine or tangent of an angle.
0:12 Formulas for sine, cosine and tangent sum and difference formulas
1:09 Example 1 Finding 7pi/12 using the sine sum formula
3:31 Example 2 looks at condensing a cosine sum expression
4:37 Example 3 looks at working with the tangent difference formula
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