在一些数学辅导资料和一些教师课堂上,常常会见到或听到一些很巧妙的解法,它简捷、流畅、优美,给人以美的享受.但有些解法稍有不慎,就会出现意想不到的错误.下面结合一道三角函数题来说明,并对此题进行一般 In some math tutorials and some teachers’ classrooms, you often see or hear some clever solutions, which are simple, smooth, graceful, and enjoyable to the United States, but some solutions may seem unexpected Error. The following combination of a trigonometric function to illustrate, and the general question