absolute values, triangle inequality

|a + b | <= |a| + |b|



|a - b | >= | |a| - |b| |


Is |a| - |b| >= |a - b|
(a) b > a

(b) a >0


1. b > a > 0 |b| - |a| > 0
b > 0 > a the sign of |b| - |a| can't be det
0 > b > a |b| - |a| < 0

C is the ans