你的邮件地址:Meimei@163.com
你朋友的邮件地址:Lucy@supermail.com
主题:How are you?
正文:向Lucy问好,告诉她你这里的天气如何,并询问她那里的天气怎么样?告诉Lucy你这个星期很忙,下星期天你想去参观故宫,并告诉Lucy你会拍很多照片。
To:_______________________
From:____________________
Subject:___________________
Dear Lucy,
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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