函数f（x）=cos（-x2）+sin（π-x2）（x∈R）．（1）求f（x）的 发布时间：2017-04-16 20:09 │ 来源：www.tikuol.com 题型：解答题 问题： 函数f（x）=cos（-x2）+sin（π-x2）（x∈R）．（1）求f（x）的周期；（2）若f（α）=2105，α∈（0，π2），求tan（α+π4）的值．
题型：解答题 选词填空。 Happy for hug what move I see show Asia want across when person say word When I was growing up in America, my family often hugged each other. Hugging was a way for us _1_ our love for each other. Whenever I _2_ something special from my father, I would always first ask, "Dad, can I have a hug?" I knew that with these _3_ I could melt his heart. After a hug, he was willing to do just about anything _4_ me. _5_ is it about _6_ that is so powerful? Somehow simply having another _7_ arms around us can make us feel easily accepted. When I _8_ to Asia, I learned that not all families hug each other as much as _9_. In fact, many of my _10_ friends say that hugging seldom happens in their home. A few years ago, I went with a friend to his parents' home in Japan. He _11_ his parents for two years. _12_ we entered his home, I expected his parents to immediately embrace (hug) him. Instead, his father just raised his had and _13_ hello. His mother _14_ welcomed him home, but she did it _15_ the room. 1. __________ 2. __________ 3. __________ 4. __________ 5. __________ 6. __________ 7. __________ 8. __________ 9. __________ 10. __________ 11. __________ 12. __________ 13. __________ 14. __________ 15. __________ 查看答案