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At the end of the 5． (学期), we invited Rose to speak at our dinner party. She c 6． her throat and began, “We don’ t stop playing because we are old; we grow old because we stop playing. There are only three keys to s 7． young and happy. First, you have to laugh every day. Second, you should have a dream. W 8． you lose your dream, you die. Third, have 9． regrets.”
At the end of the year, Rose finished all the courses. The wonderful woman taught us that it was never too 10． to be all one could possibly be.
同类型试题
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
