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(i) यदि = [(cos alpha,sin alpha),(-sin ...

(i) यदि = `[(cos alpha,sin alpha),(-sin alpha,cos alpha)]`, तो दिखाएँ कि `A'A = I_(2)`.
(ii) यदि `A = [(sin alpha,cos alpha),(-cos alpha,sin alpha)]`, तो सत्यापित करे कि A' A = I.

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