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Jack went to a barber shop and got his hair (cut). When he came out, he was unhappy with the result. His friend Bob saw him and
Jack said, “I tried a new barber shop today because I wasn’t happy with my old one. But this one seems even
Bob agreed, “Yes, I think you’re right, Jack. Next time when you go into a barber shop, look at all the barbers’ hair. Find
“Why shall we go to him?” Jack asked. “That would be stupid!”
“No, it wouldn’t,” answered Bob. “Who cut that man’s hair? Just think. It was
同类型试题
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
