题目内容

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,相位及初相.
(2)的图像可由的图像怎样变化得到?
(3)设的反函数为,求的值.

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
    ∴      ∴     ∴
·········································································· 13分
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