[" If "A" and "B" are two orthogonal mat...

[" If "A" and "B" are two orthogonal matrices of order "n" and "det(A)+det(B)=0," then which "],[" of the following must be correct? "],[" A) Det "(A+B)=det(A)*det(B)],[" B) "det(A+B)=0],[" C) "A" and "B" both are singular matrices "],[" D) "A+B=0]

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