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[" 2.In a triangle "ABC,2ca sin(A-B+C)/(...

[" 2.In a triangle "ABC,2ca sin(A-B+C)/(2)" is equal to "],[[" (a) "a^(2)+b^(2)-c^(2)," (b) "c^(2)+a^(2)-b^(2)," (c) "b^(2)-c^(2)-a^(2)," (d) "c^(2)-a^(2)-b^(2)]]

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