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sin(A+B) where sin(A) = -6/7, 3pi/2 <= A <= 2pi, tan(B) = 2/3, pi <= B <= 3pi/2
sin(A+B) where sin(A) = -6/7, 3pi/2 <= A <= 2pi, tan(B) = 2/3, pi <= B <= 3pi/2
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