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Trigonometry Formulas Involving Sum To Product Identities.

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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