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Can someone point how to approach this problem- we had 5 problems on directional derivatives and I solved 4. I understand the concept but in this question I don't know where to begin

__Problem Statement__Assume that f:R[tex]^{n}[/tex] -> R[tex]^{m}[/tex] is a linear map, with matrix A with respect to the canonical bases. Show that Df(xo) = f for every xo [tex]\in [/tex] R[tex]^{n}[/tex]

Plz advise - I will probably post follow-up questions to any answers

Thanks

Asif