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Cos a b. 2cos a+b/2 cos a-b/2. 2sin a+b/2. Cos2b. Cos a/2+b/2 cos a/2-b/2.
2cos a+b/2 cos a-b/2. 2sin a+b/2. Cos2b. Cos a/2+b/2 cos a/2-b/2.

See also