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यदि `vecA = -2hati + 3hatj + hatk` तथा `vecB = hati + 2hatj - 4hatk` हों,तो `vecA` व `vecB` के बीच कोण ज्ञात कीजिए |

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यदि `vecA = -2hati + 3hatj + hatk` तथा `vecB = hati + 2hatj - 4hatk` हों,तो `vecA` व `vecB` के बीच कोण ज्ञात कीजिए |
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Correct Answer - `90^(@).`
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