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

Related Videos:

Double Angle Formulas:
   • How to Use Double Angle Formulas  

Half Angle Formulas:
   • Half Angle Formulas - How to Use  

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