a/b+c,b/c+a,c/a+b are in ap&a+b+c=0prove that 1/b+c,1/c+a,1/a+b
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a+b+c (1/b+c,1/c+a,1/a+b)
a+b+c=0 (
1/b+c,1/c+a,1/a+b
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