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## Homework Statement

find a basis of the subspace W:=A[tex]\in[/tex] M2*2(R) : trace (A)=0 of the vector space M2*2 (R) and hence determine the dimension of W

## Homework Equations

## The Attempt at a Solution

trace(A) denote the the sum of the diagonal elements of the matrix A=aij

do i need to choose some vectors to form a basis ,hence to determine the dimension ?