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Calculating gradients - polynomials

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Given $y=\\var{a[1]}x^2+\\var{b[1]}x+\\var{c[1]},$ first calculate the differential $y^\\prime (x) = \\frac{dy}{dx}$ and then gradient $y^\\prime (\\var{x[1]}) $ at point $x = \\var{x[1]}$

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$y^\\prime (x) =$ [[0]]

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$y^\\prime (\\var{x[1]}) =$ [[1]]

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