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1−2sin10°cos10°
sin170°−
1−si
n
2
170°
=______．
人气：152 ℃ 时间：2019-08-19 14:19:13
解答
1−2sin10°cos10°
sin170°−
1−si
n
2
170°
=
(sin10°−cos10°
)
2
sin10°−
co
s
2
10°
=
cos10°−sin10°
sin10°−cos10°
=-1．
故答案为：-1．
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