1.

The non-zero vectors a→, b→ and c→ are related by a→=8b→ and c→=-7b→, then the angle between a→ and c→ is ____________.

Answer» The non-zero vectors a→, b→ and c→ are related by a→=8b→ and c→=-7b→, then the angle between a→ and c→ is ____________.


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