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किसी भी सदिश \(\overrightarrow{a}\) के लिए सिद्ध कीजिए कि \(|\overrightarrow{a}\times\hat{i}|^2+|\overrightarrow{a}\times\hat{j}|^2+|\overrightarrow{a}+\hat{k}|^2\) = \(2|\overrightarrow{a}|^2\)

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