SOLUTION: I need help with this problem too: Evaluate the following limit: The limit of {{{sin(x - pi)/(x - pi)}}}, as x approaches {{{pi}}}

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Question 1028822: I need help with this problem too:
Evaluate the following limit:
The limit of , as x approaches

Found 2 solutions by ikleyn, rothauserc:
Answer by ikleyn(52786)   (Show Source): You can put this solution on YOUR website!
.
I need help with this problem too:
Evaluate the following limit:
The limit of , as x approaches
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The limit of  ,  as x approaches ,  is the same as 

the limit of , as y approaches .


The last limit equals 1 (one).
It is one of the basic facts of the calculus.


Answer. The limit of  , as x approaches ,  equals 1.


Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
limit as x approaches pi of (sin(x-pi)) / (x-pi)
:
simplify the expression inside the limit
:
(sin(x-pi)) / (x-pi) = sin(x) / (pi-x)
:
limit as x approaches pi of sin(x) / (pi-x)
:
this intermediate result is of the form 0/0, apply l'Hopital's rule
:
limit as x approaches pi of sin(x) / (pi-x) = limit as x approaches pi of (d sin(x)/dx) / d (pi-x)/dx) =
:
limit as x approaches pi of cos(x) / -1 =
:
limit as x approaches pi of -cos(x)
:
substitute pi for x in the expression
:
**************************************************
limit as x approaches pi of -cos(x) = -cos(pi) = 1
**************************************************
:

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