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Equation of common tangent of y=x^2,y=-...

Equation of common tangent of `y=x^2,y=-x^2+4x-4` is

A

`y=4(x-1)`

B

`y=0`

C

`y= -4(x-1)`

D

`y= -30x-50`

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The correct Answer is:
A, B
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