What will be the value of cos (alpha-beta) when sin alpha + sin beta=cos gamma and cos alpha + cos beta=sin gamma? - Quora
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trigonometry - $2 \cos \alpha \cos \beta = \cos( \alpha + \beta) + \cos(\alpha −\beta)$ - Mathematics Stack Exchange
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Trigonometric Addition Formulas -- from Wolfram MathWorld
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Solved Use the formula cos (alpha plusminus beta) = cos | Chegg.com
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