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There are four brothers under the tree. They're all blind. Here comes a man on an elephant, but they can't see it. The brothers all touch the elephant. One says, "The elephant is smooth and hard." Another brother says, "The elephant is big and thick." "The elephant is big and soft." But the last brother says, "The elephant is long and thin." Are they right?
1．There are four blind brothers in this story.2．They can see an elephant over there.
3．The elephant is smooth and hard.
4．The elephant is big and thick.
5．The elephant's nose is long.
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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
