1.

If →a,→b and →c are vectors such that →a+→b+→c=→0 and |→a|=7,|→b|=5 and |→c|=3, then the angle between →b and →c is

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If a,b and c are vectors such that a+b+c=0 and |a|=7,|b|=5 and |c|=3, then the angle between b and c is



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