sin a+sinb=-21/65 &cos a+cos B=-27/65 then cos a-b/2=
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(sina+sinb)=21/65
cosa+cosb=27/65
David this we get
tana-b/2=21/27
cosa-b=27/65
cosa+cosb=27/65
David this we get
tana-b/2=21/27
cosa-b=27/65
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