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[" If "cos alpha+cos beta=a,sin alpha+si...

[" If "cos alpha+cos beta=a,sin alpha+sin beta=b& alpha-beta=2 theta," then "(cos3 theta)/(cos theta)],[" (A) "a^(2)+b^(2)-2],[" (B) "a^(2)+b^(2)-3],[" (C) "3-a^(2)-b^(2)],[" (D) "(a^(2)+b^(2))/4]

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