Question

如何从直角坐标化成极坐标拜托各位大神

Answer 1

2'表2开方.点P（-3,兀/12),直线PO与X轴夹角兀/12=15度,OP=-3即P在Y轴左侧,三象限,横坐标x=-3Cos(兀/12)=-3('6' '2')/4；纵坐标y=-3Sin(兀/12)=-3('6'-'2')/4；P[-3('6' '2')/4,-3('6'-'2')/4].