Images SINB COS A B

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Sinb cos a b. Sina SINB. Sina SINB 2sin a+b/2 cos a-b/2. Cos(a+b)=cos a cos b-SINB. Cosa*cos2a*cos4a.
Sina SINB. Sina SINB 2sin a+b/2 cos a-b/2. Cos(a+b)=cos a cos b-SINB. Cosa*cos2a*cos4a.

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