Posted by: no_quiero July 26, 2010
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Bhariya your derivation is wrong. 
If you know the basic rule of algebra we always try to avoid situation like 0 divided by 0 . Even in derivative we put tends to 0 rather than 0/0 to derivation.
In your derivation on fourth line, you have removed (a-b) = (a-b) from both side which is to say (a-b) divided by (a-b) equals 1. But since a =b , you are basicially writing 0 divided by 0 equals 1.
Which is wrong. We should always avoid situation like 0 divided by 0 as it is indeterminate.
If you know the basic rule of algebra we always try to avoid situation like 0 divided by 0 . Even in derivative we put tends to 0 rather than 0/0 to derivation.
In your derivation on fourth line, you have removed (a-b) = (a-b) from both side which is to say (a-b) divided by (a-b) equals 1. But since a =b , you are basicially writing 0 divided by 0 equals 1.
Which is wrong. We should always avoid situation like 0 divided by 0 as it is indeterminate.