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[" Q.5If "sin alpha+sin beta=a" and "cos...

[" Q.5If "sin alpha+sin beta=a" and "cos alpha-cos beta=b" ,then "],[qquad [tan((alpha-beta)/(2))" is equal to- "],[[" (A) "-(a)/(b)," (B) "-(b)/(a)],[" (C) "sqrt(a^(2)+b^(2))," (D) None of these "]]]

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