There are f1． s2． in a year. I like autumn best (最

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所属科目：小学英语

There are f1． s2． in a year. I like autumn best (最). It is in S3．, October and N4．. It is c5． in autumn. We usually go and look the falling leaves. They are beautiful. Sometimes we go c6． with our f7． or friends. The Mid-Autumn Festival and the double Ninth Festival are in autumn. We get t8． with our family. We always have a lot of f9．.

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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

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2019-09-19

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