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[" 4.In a triangle "ABC,a,b,c" are the l...

[" 4.In a triangle "ABC,a,b,c" are the lengths of its sides and "A,B" ,"],[C" are the angles of triangle "ABC" .The correct relation is "],[" given by "],[[" (a) "(b-c)sin((B-C)/(2))=a cos(A)/(2)," ( "20055" ) "],[" (b) "(b-c)cos((A)/(2))=a sin(B-C)/(2)],[" (c) "(b+c)sin((B+C)/(2))=a cos(A)/(2)],[" (d) "(b-c)cos((A)/(2))=2a sin(B+C)/(2)]]

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