△ABC的三个内角A,B,C的对边分别a,b,c,且acos C,bcos B,ccos A成等差数列,则角B等于( )
A.30° | B.60° | C.90° | D.120° |
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△ABC的三个内角A,B,C的对边分别a,b,c,且acos C,bcos B,ccos A成等差数列,则角B等于( )
A.30° | B.60° | C.90° | D.120° |
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