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问题 解答题
函数y=Asin(ωx+φ)(A＞0，ω＞0，-
π
2
＜φ＜
π
2
)的图象相邻的最高点与最低点的坐标分别为(
5π
12
，3)，(
11π
12
，-3)，求函数解析式．
答案

由题意知A=3，周期T=2(

11π
12
-
5π
12
)=πω=
2π
T
=2

∴y=3sin（2x+ϕ）3=3sin(

5π
6
+ϕ)-3=3sin(
11π
6
+ϕ)-
π
2
＜ϕ＜
π
2

∴ϕ=-

π
3

∴解析式为y=3sin(2x-

π
3
)

单项选择题

Which of the following statements concerning taxable bonds is TRUE（）

A. Corporates have the lowest yields, followed by Treasuries, then by corporates, which provide the highest returns.

B. Treasuries have the lowest yields, followed by corporates, then by agencies, which provide the highest returns.

C. Treasuries have the lowest yields, followed by agencies, then by corporates, which provide the highest returns.
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填空题

羊毛属于（）纤维，棉属于（）纤维。
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