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=Chapter 10 - Trigonometric Addition Formulas =

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Section 10-1

 * Formulas for cos (a ± b) and sin (a ± b)

~ cos (a + b) = cos a cos b - sin a sin b ~ cos (a - b) = cos a cos b + sin a sin b ~ sin (a + b) = sin a cos b + cos a sin b ~ sin (a - b) = sin a cos b - cos a sin b