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

[" If "sin alpha+sin beta=a" and "cos alpha-cos beta=b," then "tan(alpha-beta)/(2)=],[[" (a) "-(a)/(2)," (b) "-(b)/(a)," (c) "sqrt(a^(2)+b^(2))," (d) none of these "]]

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