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[" In "Delta ABC,quad (b+c)cos A+(c+a)co...

[" In "Delta ABC,quad (b+c)cos A+(c+a)cos B],[+(a+b)cos C=],[[" (A) "a+b+c," (B) "2(a+b+c)],[" (C) "(a+b+c)/(2)," (D) "(a+b+c)/(4)]]

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