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                ## asin ## 取反正弦函數值 ### 相關函數 ### acos , atan , atan2 , cos , sin , tan ### 表頭文件 ### ``` #include <math.h> ``` ### 定義函數 ### ``` double asin(double x) ``` ### 函數說明 ### asin()用來計算參數x的反正弦值,然后將結果返回。參數x范圍為-1至1之間,超過此范圍則會失敗。 ### 返回值 ### 返回-PI/2之PI/2之間的計算結果。 ### 錯誤代碼 ### EDOM參數x超出范圍 ### 附加說明 ### 使用GCC編譯時請加入-lm ### 范例 ### ``` #include<math.h> main() { double angle; angle = asin (0.5); printf("angle = %f\n",angle); } ``` ### 執行 ### ``` angle = 0.523599 ```
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