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设a,b,c表示△ABC的三边,当a~n,b~n,c~n(n∈Z且n≠0)组成等差数列时,我们探求角B的取值范围。
Let a, b, c denote the three sides of △ABC. When a~n, b~n, c~n (n∈Z and n≠0) form an equal difference sequence, we search for the range of angle B.