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已知向量,,定义 (1)求出的解析式.当时,它可以表示一个振动量,请指出其振幅,...

已知向量6ec8aac122bd4f6e6ec8aac122bd4f6e,定义6ec8aac122bd4f6e

(1)求出6ec8aac122bd4f6e的解析式.当6ec8aac122bd4f6e时,它可以表示一个振动量,请指出其振幅,相位及初相.

(2)6ec8aac122bd4f6e的图像可由6ec8aac122bd4f6e的图像怎样变化得到?

(3)设6ec8aac122bd4f6e6ec8aac122bd4f6e的反函数为6ec8aac122bd4f6e,求6ec8aac122bd4f6e的值.

 

 

17.(1)             ·········································································· 4分 其振幅为,相位为,初相为················································ 7分 (2) 可由图象横坐标不变,纵坐标伸长到原来的倍,再把曲线上所有的点向左平移个单位,即可得的图象.································································· 9分 (3) 由得 ∵     ∴       ∴      ∴ ∴ ·········································································· 13分 【解析】略
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