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Question

If A and B are skew symmetric matrices then (AB - BA) is a matrix and (AB + BA) is a matrix.

A
skew - symmetric
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B
symmetric matrix
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C
null matrix
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D
identity matrix
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Solution

The correct option is B symmetric matrix
A and B are skewsymmetricmatricesAT=A, BT=BNow,(AB+BA)T=BTAT+ATBT= (B)(A)+(A)(B)=BA+AB(AB+BA) is symmetric(ABBA)T=BTATATBT= (B)(A)(A)(B)=BAAB=(ABBA)(ABBA) is skewsymmetric

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