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math.h文件

在运行PM_sensorless程序时,sin(0.5*PI)和_IQsinPU(0.25)计算出的值都不等于1,并且相差很大是0.23之类的,但他们计算出来的结果都一样,程序中包含<math.h>和"IQmathLib.h"文件,请问这是怎么回事,有什么解决办法?