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An old tiger lived in the forest (森林). He didn't look for food himself (他自己). One day, He was very hungry (饥饿). He said to the monkey, “Go and look for food for me!” “Sorry, I can't. There is a tiger over there too. I'm afraid of him!” “What?” the old tiger was angry. “Show me that tiger!” “Come with me, please.” said the monkey. They came to the river. “Look, he's in the river! He says he's the king (国王) in the forest!” The tiger was very angry, “I'll eat him up!” With these words, the tiger jumped into the river.
1．The old tiger looked for food himself.2．The monkey looked for food for the tiger.
3．There was only one tiger in this story.
4．The old tiger jumped into the river.
5．将划线句子翻译成中文：
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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
