powf的精选

、三角函数doublesin(double)正弦doublecos(double)余弦doubletan(double)正切2、反三角函数doubleasin(double)结果介于[-PI/2，PI/2]doubleacos(double)结果介于[0，PI]doubleatan(double)反正切(主值)，结果介于[-PI/2，PI...