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