∆ABC的内角A,B,C的对边分别为a,b,c,已知cosC=,a =1,c=2,则∆ABC的面积为

ABC的内角A,B,C的对边分别为a,b,c,已知cosC=,a =1c=2,则ABC的面积为

A.               B.               C.               D.

答案

C

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