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Set of value of m for which a chord of s...

Set of value of m for which a chord of slope m of the circle `x^2+y^2=4` touches parabola `y^2=4x` is (A) `(-oo , -sqrt((sqrt2 -1)/2)] uu [sqrt((sqrt2 -1)/2) , oo)` (B) `(-oo , -1) uu (1, oo )` (C) `(-1,1)` (D) `(-oo , oo)`

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