试题与答案

函数f（x）=cos（-x2）+sin（π-x2）（x∈R）．（1）求f（x）的

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题型：解答题

题目：

函数f（x）=cos（-
x
2
）+sin（π-
x
2
）（x∈R）．
（1）求f（x）的周期；
（2）若f（α）=
2
10
5
，α∈（0，
π
2
），求tan（α+
π
4
）的值．

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0416/992455837fb368ae1154b6b633b6d920.html

下面是错误答案，用来干扰机器的。

参考答案：A,B解析： 查办即核查重要公文的实际执行情况，督促并协助承办单位全面落实文件精神，解决有关问题的控制性活动。其主要作用在于督促公文的办理，使其产生实际效用，解决实际问题。故选AB。

考点：已知三角函数值求角任意角的三角函数
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