Matrix & Basis: Find D Matrix for V

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Consider a) f1=1, f2=sinx , f3=cosx
b) f1=1, f2=ex , f3=e2x

c)f1=e2x , f2=xe2x f3=x2e2x


in each part B={f1,f2,f3} is a basis for a subspace V of the vector space.
Find the matrix with respect to B of the differentiation operator D:V→V
 
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