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[cos alpha+cos beta=a,sin alpha+sin beta...

[cos alpha+cos beta=a,sin alpha+sin beta=b],[alpha-beta=2 theta rArr(cos3 theta)/(cos theta)=],[" 1) "3-a^(2)-b^(2)quad " 2) "(a^(2)+b^(2))/(4)],[" 3) "a^(2)+b^(2)-1quad " 4) "a^(2)+b^(2)-3]

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