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The ends A and B of a rod of length sqrt...

The ends A and B of a rod of length `sqrt 5` are sliding along the curve `y = 2x^2.` Let `x_A and x_B` be the x-coordinate of the ends. At the moment when A is at (0, 0) and B is at (1, 2) the derivative `(d x_b)/(d x_A)` has the value equal to

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