Find the tangent equation of parabola y = 1 / 4x ^ 2 at P (2,1) and (- 2,1)

y'=x/2
X = 2, y '= 1, that is, the slope is 1
X = - 2, y '= - 1, that is, the slope is - 1
So p is x-y-1 = 0
(- 2,1) is x + y + 1 = 0

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