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三角函数是高中数学的重点内容,由于其具有不同于其他函数的特殊性质,在问题考查中更显得灵活多变,从而对于问题的解决亦可从多角度进行．
The trigonometric function is the key content of high school mathematics. Because it has special properties different from other functions, it is more flexible and changeable in the problem investigation, so that the problem can be solved from multiple angles.