powf的精選

、三角函數doublesin(double)正弦doublecos(double)餘弦doubletan(double)正切2、反三角函數doubleasin(double)結果介於[-PI/2，PI/2]doubleacos(double)結果介於[0，PI]doubleatan(double)反正切(主值)，結果介於[-PI/2，PI...