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                ## sin ## 取正玄函數值 ### 相關函數 ### acos,asin,atan,atan2,cos,tan ### 表頭文件 ### ``` #include<math.h> ``` ### 定義函數 ### ``` double sin(double x); ``` ### 函數說明 ### sin()用來計算參數x的正玄值,然后將結果返回。 ### 返回值 ### 返回-1 至1之間的計算結果。 ### 附加說明 ### 使用GCC編譯時請加入-lm。 ### 范例 ### ``` #include<math.h> main() { double answer = sin (0.5); printf("sin(0.5) = %f\n",answer); } ``` ### 執行 ### ``` sin(0.5) = 0.479426 ```
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