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It’s Sunday afternoon. There is a football match between Class 2 and Class 4. Many students are excited. Zhang Peng passes the ball to Wu Yifan. But he can’t kick the ball. Then John has the ball. He kicks it. The ball flies to Zhang Peng’s arm. Zhang Peng is very angry. Finally, the ball lies into the gate. Their class kicks a goal. How is Zhang Peng feeling now? Guess! He is so happy! Hooray! Class 4 wins the game. Class 2 is very sad.
1．There is a basketball match on Sunday afternoon.2．Wu Yifan can’t kick the ball.
3．Zhang Peng passes the ball to John.
4．Zhang Peng 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
