Answers

2014-10-11T19:01:35+05:30
(a+b)-(a-b)
=a+b-a+b
=2b.........[as a nd a got cancel up.
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2014-10-11T19:11:10+05:30
(a+b ) - ( a - b )

a  +  b
a  -  b
---------
   + 2b
----------

so the answer is 2b.......
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