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Tom and Bill are playing near Mr Smith's house. They are playing football. Bill is kicking a goal, and he says to Tom, “Look at the football!” “Look out!” “Oh, dear!” Mr Smith's window is broken. He is watering his flowers. “I'm sorry, Mr Smith,” says Bill. “It doesn't matter. Please don't play near my house next time,” Mr Smith said.
1．Tom and Bill are playing football. （2．Tom is kicking a goal. （
3．Mr Smith's window is broken. （
4．Mr Smith is drinking tea. （
5．Mr Smith is very angry. （
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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
