Find a nonsingular matrix C such that $$ C^{'}AC = begin{bmatrix} 1 & 0 & 0

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Find a nonsingular matrix C such that

$$

C^{'}AC = \begin{bmatrix} 1 & 0 & 0 \\ 0 & -1 & 0 \\ 0 & 0 & 0 \end{bmatrix}.

$$

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