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求初相角是高中三角函数中的一个重点内容,同学们在解题时忽视了角的范围,时常出现多余答案．为了帮助同学们突破这一难点,现举例解析如下：
Finding the initial phase angle is a key part of the high school trigonometric function. When classmates solve the problem, they neglect the scope of the angle and often have redundant answers. In order to help the students break through this difficult point, the following examples are as follows: