One day there are four blind men under a tree. They are talking about elephants. An old man is riding an elephant past them(经过他们身边). He lets them touch it. A blind man touches the ear. He says the elephant is like a fan(扇子). A blind man touches the tail. He says the elephant is like a rope(绳子). A blind man touches the leg. He says the elephant is like a tree trunk(树干). A blind man touches the body. He says the elephant is like a wall. What about you?
1.There are four blind men under a tree. (
2.The blind men cannot see an elephant. (
3.The elephant is like a fan. (
4.The elephant is like a tree trunk. (
5.The elephant's body is like a wall. (
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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