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यदि A = [{:(0,, -tan ""(alpha)/(2)),(tan...

यदि `A = [{:(0,, -tan ""(alpha)/(2)),(tan ""(alpha)/(2),,0):}]` तथा I कोटि 2 का एक तत्समक आव्यूह है | सिद्ध कीजिए कि `I + A = (I-A) [{:( cos alpha ,, sin alpha), ( sin alpha,, cos alpha):}] `

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