Objective
To use the sum and difference formulas to evaluate each trigonometry angle without using a calculator.
Web Resources
http://www.mathwords.com/s/sum_difference_identities.htm List of the sum and difference formulas
http://www.regentsprep.org/Regents/math/algtrig/ATT14/formulalesson.htm Notes and Examples
http://hotmath.com/hotmath_help/topics/sum-and-difference-identities.html Formulas and worked out examples
http://worksheets.tutorvista.com/sum-and-difference-identities-worksheet.html Practice problems with solutions
http://www.regentsprep.org/Regents/math/algtrig/ATT14/formulalesson.htm Notes and Examples
http://hotmath.com/hotmath_help/topics/sum-and-difference-identities.html Formulas and worked out examples
http://worksheets.tutorvista.com/sum-and-difference-identities-worksheet.html Practice problems with solutions
Lesson Video
Pay Attention to the Following:
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