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三角函数是高中数学的重要内容之一.它的基础主要是几何中的相似形和圆,研究的方法主要是代数的方法.因此,三角函数的问题已经初步把代数和几何联系起来了.当把初中学过的三角函数定
The trigonometric function is one of the important contents of high school mathematics. Its basis is mainly similarities and circles in geometry. The method of research is mainly algebraic methods. Therefore, the problem of trigonometric functions has been initially associated with algebra and geometry. Set the trigonometric function that we learned in the middle school