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Let M and N be two $$3 \times 3$$ non-singular skew-symmetric matrices such that $$MN = NM$$. If $$P^T$$ denotes the transpose of P, then $$M^2N^2(M^TN)^{-1}(MN^{-1})^T$$ is equal to
$$M^2$$
$$-N^2$$
$$-M^2$$
$$MN$$
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