सिद्ध कीजिए कि सदिशों 2bar(i)-bar(j)+bar...

सिद्ध कीजिए कि सदिशों `2bar(i)-bar(j)+bar(k)` तथा `3bar(i)+4bar(j)-bar(k)` में से प्रत्येक पर लम्ब मात्रक सदिश `+-(-3bar(i)+5bar(j)+11bar(k))/(sqrt(155))` हैं और उनके बिच का साइन `sqrt((155)/(156))` है |

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