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In a triangle ABC ,\(2ac\sin \Big(\frac {A-B+C} {2}\Big)=\)
(a) \(a^2+b^2-c^2\) (c) \(b^2-c^2-a^2\)
(b) \(c^2+a^2-b^2\) (d) \(c^2-a^2-b^2\)
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