\"\"

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\"\".

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The vectors are \"\", \"\" and \"\".

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Apply dot product formula: \"\"

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\"\"                         (Substitute : \"\")

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\"\"

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\"\"

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\"\"

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\"\"                    (Substitute : \"\")

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\"\"                    (Simplify)

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\"\"

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\"\"        (Simplify) \"\"

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The result is \"\" and the result is a "scalar".