cos127的知识精选

设a=cos50°cos127°+cos40°·cos37°,b=(sin56°-cos56°),c=,则a,...
问题详情:设a=cos50°cos127°+cos40°·cos37°,b=(sin56°-cos56°),c=,则a,b,c的大小关系是()A.a>b>c                        B.b>a>cC.c>a>b                     ...
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