问题
填空题
设a=
|
答案
∵a=
cos8°-1 2
sin8°=cos60°•cos8°-sin60°•sin8°=cos68°=sin22°，3 2
b=
=tan26°2tan13° 1-tan213°
c=
=sin26°1-cos52° 2
∵sin22°＜sin26°＜tan26°
∴a＜c＜b
故答案为：a＜c＜b
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设a=
|
∵a=
cos8°-1 2
sin8°=cos60°•cos8°-sin60°•sin8°=cos68°=sin22°，3 2
b=
=tan26°2tan13° 1-tan213°
c=
=sin26°1-cos52° 2
∵sin22°＜sin26°＜tan26°
∴a＜c＜b
故答案为：a＜c＜b