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It’s Sunday afternoon. The weather is fine. There is a football match between class 2 and class 4. Many students are watching. They’re excited. Now, Zhang Wei has the ball. He passes it to Wei Kun. But Wei Kun can’t kick the ball. Then John has the ball. The ball flies to Zhang Wei’s arm. Zhang Wei is very angry. The ball files into the gate. How is Zhang Wei feeling? He is so happy! Class 4 won the game. Class 2 is very sad.
1．There is a basketball match on Sunday afternoon. （_____）2．Wei Kun can’t kick the ball. （_____）
3．Zhang Wei is happy when to ball flies to his arm. （_____）
4．Zhang Wei is happy when the ball flies into the gate. （_____）
5．Class 2 is not sad in the end. （_____）
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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
