यदि bar(a)=bar(i)+2bar(j)-3bar(k) तथा ba...

यदि `bar(a)=bar(i)+2bar(j)-3bar(k)` तथा `bar(b)=3bar(i)-bar(j)+2bar(k)`, तो दर्शाइए कि `(bar(a)+bar(b))` और `(bar(a)-bar(b))` परस्पर लम्ब हैं | साथ ही `(2bar(a)+bar(b))` और `(bar(a)+2bar(b))` के बीच का कोण ज्ञात कीजिए |

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