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[" 10.In "Delta ABC,b^(2)cos2A-a^(2)cos2...

[" 10.In "Delta ABC,b^(2)cos2A-a^(2)cos2B=],[[" (a) "b^(2)-a^(2)," (b) "b^(2)-c^(2)],[" (c) "c^(2)-a^(2)," (d) "a^(2)+b^(2)+c^(2)]]

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