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It's spring. One day, Mother Duck finds four eggs at her home. Three are small and one is big. She sits on the eggs. Three small eggs open. The ducklings are small and yellow. The big egg opens later. It's big and gray. It's ugly. Mother Duck doesn't like the ugly duckling. He is sad and swims away. In winter, it's cold. He has no home. It's spring again. The ugly duckling becomes a beautiful swan.
1．Mother Duck finds four eggs at her home.（____）2．The ugly duckling is big and yellow.（____）
3．Mother Duck doesn't like the ugly duckling.（____）
4．The ugly duckling becomes a beautiful duck next spring.（____）
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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
