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Find the adjoint of the following mat...

Find the adjoint of the following matrices: `[cosalphasinalphasinalphacosalpha]` (ii) `[1tanalpha//2-tanalpha//2 1]` Verify that `(a d j\ A)A=|A|I=A(a d j\ A)` for the above matrices.

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`(1) |A|^{2}=cos ^{2} alpha-sin ^{2} alpha= cos 2 alpha`
`C_{11}=cos alpha quad C_{12} =-sin alpha `
`C_{21}=-sin alpha quad c_{22}=cos alpha`
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