问题标题：
化简√2+cos20°-sin^210°
问题描述：
化简√2+cos20°-sin^210°
宁洪回答：
√2+cos20°-sin^210°
=√2+1-2(sin^210)--sin^210°
=√3-3sin^210°
=√3(1-sin^210°)
=√3cos^210°
=√3cos10°
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