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1−2sin10°cos10°
sin170°−
1−sin2170°
=______.
人气:446 ℃ 时间:2019-08-19 14:19:13
解答
1−2sin10°cos10°
sin170°−
1−sin2170°

=
(sin10°−cos10°)2
sin10°−
cos210°

=
cos10°−sin10°
sin10°−cos10°

=-1.
故答案为:-1.
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