Trigonometry Formulas Involving Sum To Product Identities.
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sinA+sinB = 2sin (A+B/2) cos(A−B/2)
sinA−sinB = 2cos (A+B/2) sin(A−B/2)
cosA+cosB = 2cos (A+B/2) cos(A−B/2)
cosA−cosB = –2sin (A+B/2) sin(A−B/2)
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- asked 4 years ago
- B Butts
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