已知角a的终边与函数5x+12y=0(x小于等于0),则cosa+1/tana--1/sina的值为?

5X+12Y=0y=-5/12xtanα=k=-5/12X小于等于0,∴α在第二象限cosα=-1/根号(1+tan^2α)=-1/根号(1+5^2/12^2)=-12/13sinα=根号(1-cos^2α)=根号(1-12^2/13^2)=5/13cosα+1/tanα-1/sinα=-12/13+1/(-5/12)-1/(5/13)=-12...