Let \( \mathrm{M} \) and \( \mathrm{N} \) be two \( 3 \times 3 \) non-singular skew- symmetric m....

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


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