题目
原点与极点重合,x轴正半轴与极轴重合,则点P(-6,-8)的极坐标是( )A.(10,π+arctan(-)) B.(-10,π+arctan(-))C.(-10,π+arctan) D.(10,π+arctan) 答案:解析:tanθ==,又点P在第三象限,故坐标为(10,π+arctan).∴选D.答案:DI ________ because my Mandarin isn't improving.
[ ]
A.stress outB.am stressing out
C.stressed outD.am stressed out