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सदिश veca=hati+2hatj-3hatk तथा vecb=3hat...

सदिश `veca=hati+2hatj-3hatk` तथा `vecb=3hati-hatj+2hatk` दोनो के लम्बवत एक एसा सदिश ज्ञात किजिए, जिसका परिमाण `sqrt(171)` हो।

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