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One day, I decided to tidy my bookshelf up. Suddenly, a white envelope（信封）fell to the floor. I was
| My dear child, I love you so much! This is not a letter to be posted. I have written this in the hope that one day you Life is too short and uncertain. If you are reading this, I am no longer with you. You are alone now. I’m not there to help you or give you any kind of The world around you can be confusing（令人困惑的）. But if you look inside yourself, you can light your path and find out where Yours, Mom |
I was
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
