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Dick is seven years old. His sister, Mary is five. Today their mother takes them to their grandma’s house and then she goes out. The children play football for an hour. They are tired. Their grandma gives Dick a round cake and a knife and says. “Like a gentleman, cut the cake into two pieces, and give the big piece to the other.”Dick thinks about this for a moment. He says to Mary, “You cut the cake, Mary.”
1．Dick and Mary are in the park. （2．The children play football for hours. （
3．Grandma gives Dick a piece of cake. （
4．Grandma wants to give the bigger piece to Mary. （
5．Dick likes cakes. （
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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
