# Question: Let f Rn R For x Rn a Show that Deif a Dif a

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)..

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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