学进去-教育应平等而普惠
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所属科目:小学英语
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(            ) 1. A. 6:00.                              B.6:30                                C.7:30
(            ) 2. A. see a doctor                    B. take a rest                      C. drink some water
(            ) 3. A. swimming                         B. singing                       C. dancing
(            ) 4. A. It’s cold.                         B. It is hot.                           C. It is warm and sunny.
(            ) 5. A. It’s Amy’s.                         B. It’s Lily’s.                    C. It’s the boy’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

用户名称
2019-09-19

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

用户名称
2019-09-19
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