if Cos (a+b) = square root of 3 over 2 and Sin(a-b) = square root of 3 over 2, find a+b
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cos(a+b)=√3/2
Or, cos(a+b)=cos30°
Or, a+b=30°
Or, cos(a+b)=cos30°
Or, a+b=30°
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