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Today is Tom’s birthday. His father is going shopping with him. He wants to buy a gift for his son. Tom and his father are in a big toy shop. There are so many toys in the shop. There are trains, planes, jeeps, cars, buses, ships and so on. Tom likes planes very much. He wants to buy one. The salesman shows a blue one to him. But he doesn’t like the colour. He chooses a green one. It’s nice. It’s fifty-five yuan. His father pays for it. He is very happy.
1．Tom and his father are in a toy shop.2．We can’t see a lot of toys in the shop.
3．Tom likes the green plane very much.
4．The plane is 50 yuan.
5．Tom’s mother buys a plane for him.
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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
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
