已知函数f（x）=2sin2x﹣sin2x，则函数f（x）的对称中心可以是_刷题宝

题干

已知函数f（x）=2sin²x﹣sin2x，则函数f（x）的对称中心可以是（）

A： $(- \frac{π}{8} ， 0)$

B： $(- \frac{π}{4} ， 0)$

C： $(- \frac{π}{8} ， 1)$

D： $(- \frac{π}{4} ， 1)$

上一题下一题 0.0难度选择题更新时间:2016-03-28 12:13:50

答案(点此获取答案解析）

C

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阅读理解
Tom lives in the UK. His friend Jack is in Dubai. He will go to see his friend. First he needs to go to London to take the plane.
On Friday morning, Tom takes a bus to the train station. It takes Tom about 30 minutes to get there. Tom gets on the train at about 10 o'clock：The train leaves at 10：15. The train trip to London takes three hours. At lunchtime Tom gets to London. Tom eats a hamburger for lunch. Then he goes to the airport(机场)by subway. After about one hour,Tom gets to the airport. Tom gets on the plane at 8 o'clock in the evening. The trip takes a long time. Tom is tired(疲倦的)after a busy day. So he goes to sleep(睡觉). On Saturday morning, Tom gets to Dubai. He is very happy, because he will have a great time with his friend.

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的反函数为

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