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[ 148.In Delta ABC,(sin(A-B))/(sin(A+B))...

[ 148.In Delta ABC,(sin(A-B))/(sin(A+B)) is equal to [ (1) (a^(2)-b^(2))/(c^(2)), (2) (a^(2)+b^(2))/(c^(2)) (3) (c^(2))/(a^(2)-b^(2)), (4) (c^(2))/(a^(2)+b^(2))]]

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