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                ## cosh ## 取雙曲線余玄函數值 ### 相關函數 ### sinh,tanh ### 表頭文件 ### ``` #include<math.h> ``` ### 定義函數 ### ``` double cosh(double x); ``` ### 函數說明 ### cosh()用來計算參數x的雙曲線余玄值,然后將結果返回。數學定義式為:(exp(x)+exp(-x))/2。 ### 返回值 ### 返回參數x的雙曲線余玄值。 ### 附加說明 ### 使用GCC編譯時請加入-lm。 ### 范例 ### ``` #include<math.h> main() { double answer = cosh(0.5); printf("cosh(0.5) = %f\n",answer); } ``` ### 執行 ### ``` cosh(0.5) = 1.127626 ```
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