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What is the angle θθ between vectors A⃗ A→ and B⃗ B→ if A⃗ =2ı^−7ȷ^A→=2ı^−7ȷ^ and...

What is the angle θθ between vectors A⃗ A→ and B⃗ B→ if A⃗ =2ı^−7ȷ^A→=2ı^−7ȷ^ and B⃗ =−6ı^+3ȷ^B→=−6ı^+3ȷ^?

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Let's the angle between two vector is

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The angle between two vector is

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