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[启光教育]2024年河北省中考命题专家押题卷(一)(2024.6)数学.考卷答案试卷答案
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分析根据正切函数y=tanx的图象与性质，对题目中的命题进行分析、判断，即可得出结论．
解答解：关于正切函数y=tanx的单调性，正确的描述是：
正切函数y=tanx在其定义域上是周期函数，不具有单调性，
并且正切函数y=tanx在每一个开区间（-$\frac{π}{2}$+kπ、$\frac{π}{2}$+kπ）（k∈z）上都是增函数；
所以，真命题是③．
故答案为：③．
点评本题考查了正切函数的图象与性质的应用问题，是基础题目．
