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माना a = 3 hat(i) + 2hat(j) + 2hat(k) तथ...

माना `a = 3 hat(i) + 2hat(j) + 2hat(k)` तथा `b = hat(i) + 2hat(j) - 2hat(k)` दो सदिश है । यदि दोनों सदिशों `a + b` तथा `a - b` के लंबवत एक सदिश का परिमाण 12 है, तो एक ऐसा सदिश है

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