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Mr. Johnson had his weekend with his old grandfather—Dr. Johnson yesterday. In the morning he got up at seven o'clock. He had his breakfast at half past eight. Then he went out in his yellow car and arrived at old Dr. Johnson's cabin at about 9. At noon Mr. Johnson had lunch with his grandfather. They played cards at half past two. Dr. Johnson was good at playing cards. He beat （打败） Mr. Johnson at last. So he laughed: "See? I am not too old to play with young people!"
1．How did Mr. Johnson spend his weekend yesterday? （2．Where did Mr. Johnson have breakfast ? （
3．What did they do after lunch? （
4．Who won the game at last? （
5．How did Dr. Johnson think of himself? （
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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
