1.

For 1 lt= i ,j lt= 3 let a_(ij) = int_(-pi//2)^(pi//2) cos (ix) cos (jx) dxand letA = (a_(ij))_(3xx3) . Then

Answer»

A is a SINGULAR matrix
AX = B has a UNIQUE SOLUTION for every `3xx3` matrix B
A is a skew symmetric matrix
`A^(2)=I`

Answer :B


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