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Statement of a problem № m629

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Let f: Rn ->R. For x€ Rn, a. Show that Deif (a) = Dif (a).. b. Show that Dtxf (a) = Dxf(a).. c. If f is differentiable at , show that Dxf(a) = Df(a)(x) (a) and therefore Dx + yf(a) = Dxf (a) + Dyf (a)..




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