Answer:
Let
is non-singular
matrix so A?1 exists.
A11 =
(?1)1+1(?cos2 ?sin2
) = ?1;
A12 =
(?1)1+2(0 ? 0) = 0;
A13 =
(?1)1+3(0 ? 0) = 0;
A21 =
(?1)2+1(0 ? 0) = 0;
A22 =
(?1)2+2(?cos ? 0) = ?
cos ;
A23 =
(?1)2+3(sin ?
0) = ?sin ;
A31 =
(?1)3+1(0 ? 0) = 0;
A32 =
(?1)3+2(? sin ? 0) = ?
sin ;
A33 =
(?1)3+3(cos ?0)
= cos ;
Now
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