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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