# Trigonometric Identity - Product to Sum 1/2

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**Product to Sum Trigonometric Identity Involving (sin(a)*sin(b) and cos(a)*cos(b))**

Video Tutorial: Writing a product of two sine functions and the product of two cosine functions as a sum or difference.

Downloads | 0 |

Views | 217 |

Created | Aug 14, 2013 |

Updated | Aug 14, 2013 |

Licence | TES-V1 |

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