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所属科目：小学英语

on lessons your 8th reads

Lucy is 12 years old. Her birthday is on August 1．. She is a student. She goes to school 2． time every day. She is good at each subject. And her teacher never worries about her 3．. She likes reading. But she often 4． in bed. That's not good. So her mother says, "It's bad for 5． eyes. And you'd better read at the desk." Lucy's mother is right.

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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

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2019-09-19

用户名称

2019-09-19

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