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[" 12.In "Delta ABC(a-b)^(2)cos^(2)(c)/(...

[" 12.In "Delta ABC(a-b)^(2)cos^(2)(c)/(2)+(a+b)^(2)sin^(2)(c)/(2)=],[[" A) "b^(2)," B) "c^(2)," C) "a^(2)," D) "a^(2)+b^(2)+]]

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