The eccentricity of curve ${x^2} - {y^2} = 1$ is
The eccentricity of curve ${x^2} - {y^2} = 1$ is
- A
$\frac{1}{2}$
- B
$\frac{1}{{\sqrt 2 }}$
- C
$2$
- D
$\sqrt 2 $
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