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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