问题
选择题
化简
|
答案
=1-sin100°
=sin250°+cos250-2sin50°cos50°
=|sin50°-cos50°|(sin50°-cos50)2
∵sin50°＞cos50°=sin40°
∴
=sin50°-cos50°1-sin100°
故选：C．
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化简
|
=1-sin100°
=sin250°+cos250-2sin50°cos50°
=|sin50°-cos50°|(sin50°-cos50)2
∵sin50°＞cos50°=sin40°
∴
=sin50°-cos50°1-sin100°
故选：C．