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[" 7.In a "Delta ABC" ,the value of "(ac...

[" 7.In a "Delta ABC" ,the value of "(acosA+bcosB+c cos C)/(a+b+c)],[" is equal to "],[[" (A) "(r)/(R)," (B) "(R)/(2r)],[" (C) "(R)/(r)," (D) "(2r)/(R)]]

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