题目内容
设a＝ 
(sin56°－cos56°)， b＝cos50°·cos128°＋cos40°·cos38°，c＝ 
(cos80°－2cos 250°＋1)，则a，b，c的大小关系是 ( )
2021-09-22
A.a>b>c
B.b>a>c
C.c>a>b
D.a>c>b
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