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怎样才能查看到IQmathlib.h中已经定义过的函数的是具体怎么计算的



例如  extern    long _IQ30sin(long A);    怎么样才能查看到_IQ30sin()具体的定义呢?我点住它右键选择open declaration,但是提示找不到指定路径的文件。到底是什么情况?请大神指点!!