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[" 14.If "a=bar(i)+2bar(j)-3vec k" and "...

[" 14.If "a=bar(i)+2bar(j)-3vec k" and "bar(b)=3bar(i)-bar(j)+2bar(k)," then show that "(bar(a)+bar(b))" and "(bar(a)-bar(b))" are "],[" mutually perpendicular.Also find the angle between "(2bar(a)+bar(b))" and "(bar(a)+2bar(b))" ."]

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