There are four s1． in a year. They a2． spring, sum

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There are four s1． in a year. They a2． spring, summer, autumn and winter. I3． Beijing many people like winter though it is very c4．. In winter the days become s5． and the nights get l6．. It often snows, after snowing children always play games w7． snow. It's very interesting, isn’t it? And it's a good season f8． people to make s9．.

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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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