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$\sinhx$=
Difficulty: Easy
A: 
$\frac{1}{2}(e^{x}+e^{-x})$
B: 
$\frac{2}{e^{x}+e^{-x}}$
C: 
$\frac{2}{e^{x}-e^{-x}}$
D: 
$\frac{1}{2}(e^{x}-e^{-x}}$
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