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World Book Day is an event organized by the United Nations to encourage book reading, publishing and copyright. The first World Book Day was 23rd April, 1995 and it is celebrated every year on that day. It changes people’s lives through the love of books and reading. Every year on World Book Day, children around the world get together and read their favorite books. Some organizations work hard to give every child a book of their own. Reading for pleasure is important for a young person’s future success—more important than their parents’ educational background or the money they make.
World Book Day | |
| What is World Book Day | An |
| What is World Book Day for? | To |
| When is the first World Book Day? | |
| How does World Book Day change people’s lives? | Through the |
| What does the writer think of reading for pleasure? | Reading for pleasure is important for a young person’s |
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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
