\"\"

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

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The dot product of \"\" and \"\" is \"\".

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\"\"

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\"\".

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The vectors \"\" and \"\" are orthogonal if and only if \"\".

\

Since \"\", the vectors \"\" and \"\" are not orthogonal.

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\"\"

\

\"\", the vectors \"\" and \"\" are not orthogonal.