Show that when A ⃗ + B ⃗ = C ⃗ , then C2 = A2 + B2 + 2AB cos φ , where φ is the angle between vectors A ⃗ and B ⃗ .
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Show that when A ⃗ + B ⃗ = C ⃗ , then C2 = A2 + B2 + 2AB cos φ , where φ is the angle between vectors A ⃗ and B ⃗ .
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