Question
Fri April 22, 2011 By: Saurabh Parnerkar

sir, what is principle value?

Expert Reply
Fri April 22, 2011
The numerically smallest value of the arc sine, arc cosine, or arc tangent of a number, the positive value being chosen when there are values that are numerically equal but opposite in sign.

or 

A value selected at a point in the domain of a multiple-valued function, chosen so that the function has a single value at the point.

 
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