3A Given the Euclidean inner product space (R³(R),+,,*), where for each_x=(x1,X2,X3), y=(yı,y2,y)=R³, X*y = 2(x1y1+x3y3) + x2(y1+y3) + (x1+x3)y2 + 3x2y2. Check whether the matrix A of the inner product (*) is squared with respect to the natural basis of R³, without computing its eigenvalues and eigenvectors.

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