Trigonometric Formulas

Proposition (Trigonometric Formulas) The following formulas hold for all angles and where the functions are defined  

Sum and Difference:













Double Angle:











Half Angle:











Power Reduction:









Sum-to-Product:









Product-to-Sum:

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Trigonometric Formula Sheet
Published by Library of Math -- Online math organized by subject into topics.
Written by Smith, David A.
http://www.libraryofmath.com/trigonometric-formula-sheet.html