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Patrick never did homework. “Too boring,” he said. He played baseball and basketball instead. His teachers told him, “Patrick! Do your homework, or you can’t
One day, Patrick’s cat was playing with a little “doll”. He found it wasn’t a doll at all, but a man of the smallest size. The man called, “Save me! Don’t give me back to that cat. I have
Patrick couldn’t believe how
The little elf (精灵) kicked his legs and rubbed (搓) his hands. “All right. I’ll do it.”
And true to his words, that little elf began to do Patrick’s homework. Sometimes he
“What does this word mean?” the elf cried while he was reading Patrick’s homework. “Get me a dictionary. No, what’s even better,

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

