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(i) यदि A = [{:( cos alpha ,,sin alpha),...

(i) यदि `A = [{:( cos alpha ,,sin alpha), ( - sin alpha,, cos alpha):}]` हो तो सत्यापित कीजिए कि A'A = I
(ii) यदि `A = [{:( sin alpha ,, cos alpha), (-cos alpha,, sin alpha):}]` हो तो सत्यापित कीजिए कि A' A = I

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