1.

If →a+→b+→c=→0 and |→a|=3,|→b|=5,|→c|=7 and the angle between →a and →b is α, then α=_____

Answer»

If a+b+c=0 and |a|=3,|b|=5,|c|=7 and the angle between a and b is α, then α=_____



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