The equations of the common tangents to the parabola y=x^2 and y=-(x-2)^2 is/are (1) y=4(x-1) (2)...

The equations of the common tangents to the parabola y=x^2 and y=-(x-2)^2 is/are
(1) y=4(x-1)
(2) y=0
(3) y=-4(x-1)
(4) y=-30 x-50

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