化简1−2sin10°cos10°sin10°−1−sin210°=_．
问题描述：
化简
=______．
1−2sin10°cos10°
sin10°−
1−sin210°
答
=
1−2sin10°cos10°
sin10°−
1−sin210°
=|sin10°−cos10°| sin10°−cos10°
=-1cos10°−sin10° sin10°−cos10°
故答案为：-1