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  4. Common tangent of curve y2 = 4 2x and x2 + y2 = 1 is ax + y = c then |c| is -

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Q. Common tangent of curve $y^2$ = 4 2x and $x^2$ + $y^2$ = 1 is ax + y = c then |c| is -

Solution:

Correct answer is (c) $\sqrt{2}$