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Equation of a line which is tangent to...

Equation of a line which is tangent to both the curve `y=x^2+1\ a n d\ y=-x^2` is

A

A) `y=sqrt2x+(1)/(2)`

B

B) `y=sqrt2 x-(1)/(2)`

C

C) `y=-sqrt2x+(1)/(2)`

D

D) `y-sqrt2x-(1)/(2)`

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The correct Answer is:
A, C
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