Mrs. Black lives in a small village. Her husband is dead. Her son, Jack, lived with her. He worked in a shop in the village, but then he got a job in a town named Greensea. He went to live there. Mrs. Black was very angry. She got on a train and went to see her son. It took her almost 5 hours to get there. Then she said to him, "Jack, why do you never telephone me?" Jack laughed, "But, Mum, you haven't got a telephone." "No." she answered, "I haven't, but you have got one."
1.Mrs. Black lives in a small city. (
2.Mrs. Black's son got a job in a town. (
3.Greensea is far from Mrs. Black's home. (
4.She went to see her son by bus. (
5.Mrs. Black didn't have a telephone at home. (
6.Jack didn't have a telephone. (
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)