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If sin x - sin y = a " and "cos x + cos ...

`If sin x - sin y = a " and "cos x + cos y = b,"show that " "tan" (x+y)/2 = pm sqrt((4-a^(2)-b^(2))/(a^(2)+b^(2)))`

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`tan (x+y)/2 = pm sqrt((4-a^(2)-b^(2))/(a^(2)+b^(2)))`
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