From: Mazaheri <mo_mazaheri20@yahoo.com>
To: Teacher2Teacher Public Discussion
Date: 2007091112:37:01
Subject: lim sin x / x when  x--- > 0 and L'Hopital's rule

	
  Your example and explaination was great and too useful in applied
works.Of course we must be more careful about logically deducing chain
in precise mathematics.When we get derivative of sinx ,we have used
L'Hopital's rule to (sinx-sinx0)/(x-x0),assuming that rule is true and
lim sin((x-x0)/2)/(x-x0)=1/2.
Thanks.

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