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The mirror image of the parabola y^2=...

The mirror image of the parabola `y^2=4x` in the tangent to the parabola at the point (1, 2) is `(x-1)^2=4(y+1)` (b) `(x+1)^2=4(y+1)` `(x+1)^2=4(y-1)` (d) `(x-1)^2=4(y-1)`

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