设a=(sin56°-cos56°), b=cos50°·cos128°+cos40°·cos38°,
c= (cos80°-2cos250°+1),则a,b,c的大小关系是 ( ).
A.a>b>c | B.b>a>c | C.c>a>b | D.a>c>b |
推荐试卷
设a=(sin56°-cos56°), b=cos50°·cos128°+cos40°·cos38°,
c= (cos80°-2cos250°+1),则a,b,c的大小关系是 ( ).
A.a>b>c | B.b>a>c | C.c>a>b | D.a>c>b |
试题篮
()