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在求解三角函数问题时,三角函数求值、求角是常见的题型,有的时候形式上是两解,实质上是只有一解,那么怎样排除增解?下面结合例题谈谈排除增解的方法:
When solving the trigonometric function problem, the trigonometric function evaluation and seeking angle are common questions. Sometimes there are two solutions in form. There is only one solution in essence. How to eliminate the solution? Methods: