We know that
-
= 1.
When we substitute
=
,
then, 
- 
=
-
= 0.
Then how is it that the above identity is applicable for all possible values for
, as is mentioned in many textbooks?











Asked by bjayanta
| 22nd Jul, 2015,
09:54: PM
Expert Answer:

Answered by Vimala Ramamurthy
| 23rd Jul, 2015,
10:40: AM
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