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Tom is a little boy. He is four. Today his mother is taking him to see his grandmother. His grandmother's home is very far. So they are going there by bus. There are only twenty people on the bus. They are all sitting on their seats. Tom is very happy. He is running on the bus. His mother asks, “Why are you running?” “I like to see my grandmother very much. I want this bus to go fast.” Tom answers.
1．On the bus, there are 27 people. （2．Tom is a little baby. （
3．Everyone has a seat on the bus. （
4．When his mother sees him running, she feels surprised. （
5．Tom wants to see his grandmother quickly. （
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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
