- #1

transgalactic

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http://img352.imageshack.us/my.php?image=34860604zw7.gif

i need to use the triangle innequality

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

how to apply it to my question?

it a long way from

triangle innequality formula to the expression that i was given in the question

??