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In winter, there are many lovely animals in the arctic, such as (比如) arctic foxes, arctic hares and polar bears and so on (等等). Arctic foxes have very nice fur and they live in groups in winter. Arctic hares can run quite fast. In winter they often hide in the warm tunnels. Polar bears always hunt arctic hares as their food.
1．In winter, there are Arctic foxes in the arctic. （____）2．Arctic hares run slowly. （____）
3．Arctic foxes hunt arctic hares as their food. （____）
4．Polar bears hide in the warm tunnels. （____）
5．Arctic hares live in groups in winter. （____）
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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
