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Editor
 Sep 18, 2022
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$\coth^{-1}x$=
Difficulty: Easy
A: 
$ln(x+\sqrt{x^{2}-1})$
B: 
$ln(x+\sqrt{x^{2}+1})$
C: 
$\frac{1}{2}ln(\frac{1+x}{1-x})$
D: 
$\frac{1}{2}ln(\frac{x+1}{x-1})$
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NETNUST Entry TestMathematicsFunctions and Limits