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                ## tan ## 取正切函數值 ### 相關函數 ### atan,atan2,cos,sin ### 表頭文件 ### ``` #include <math.h> ``` ### 定義函數 ### ``` double tan(double x); ``` ### 函數說明 ### tan()用來計算參數x的正切值,然后將結果返回。 ### 返回值 ### 返回參數x的正切值。 ### 附加說明 ### 使用GCC編譯時請加入-lm。 ### 范例 ### ``` #include<math.h> main() { double answer = tan(0.5); printf("tan (0.5) = %f\n",answer); } ``` ### 執行 ### ``` tan(0.5) = 0.546302 ```
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