Quote (feanur @ Nov 19 2017 08:19pm)
Good explanation above.
Usually, it's treated this way :
x² / ( x² - a²) = 1 / ( 1 - a²/x²)
providing x is non zero.
Now if x approaches infinity, a²/x² tends to zero.
The fraction tends to 1 / ( 1 - 0) = 1.
thanks!