mckenzievitch2900 mckenzievitch2900

20-02-2024
Mathematics

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9. Show that if \( \theta \) is the angle between \( A \) and \( B \), then \[ \|A-B\|^{2}=\|A\|^{2}+\|B\|^{2}-2\|A\|\|B\| \cos \theta \text {. } \]

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