问题
填空题
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答案
=3-sin70° 2-cos210°
=3-sin70° 2- 1+cos20° 2
=2(3-sin70°) 3-cos 20°
=22(3-cos20°) 3-cos 20°
故答案为：2
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|
=3-sin70° 2-cos210°
=3-sin70° 2- 1+cos20° 2
=2(3-sin70°) 3-cos 20°
=22(3-cos20°) 3-cos 20°
故答案为：2