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Helen is a girl of nineteen years old. She likes to eat a lot of sweets, chocolate and French fries. She can't stop eating and she's getting fatter and fatter. Last month, when she went to a party, none of the boys wanted to dance with her because she was too fat. Helen was sad and decided to go on a diet. She thinks she must not eat sweet, or, meat. She must do more exercise. And she must not sleep too much. After a month, she becomes a little thinner.
1．How old is Helen?2．What does she like to eat?
3．Why didn't boys dance with her?
4．Does she go on a diet now?
5．What must she do if she wants to be a little thin?
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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
