The line $y = x + c$will intersect the circle ${x^2} + {y^2} = 1$ in two coincident points, if
The line $y = x + c$will intersect the circle ${x^2} + {y^2} = 1$ in two coincident points, if
- A
$c = \sqrt 2 $
- B
$c = - \sqrt 2 $
- C
$c = \pm \sqrt 2 $
- D
None of these
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