<PRE><B>Question 617647</B>
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Anywhere the denominator equals zero.  Set the denominator equal to zero and solve the resulting equation for all possible values of the variable.  Those are the values for which the original rational expression is undefined.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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