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यदि A=[(cos x, sin alpha),(-sinx, cos al...

यदि `A=[(cos x, sin alpha),(-sinx, cos alpha)]` हो, तो Adj A का मान ज्ञात कीजिए तथा सिद्ध कीजिए कि
`A.(Adj A)=(Adj A). A=|A|I.`

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