$\"\"$

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The vectors are $\"straight$ , $\"straight$ .

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$\"open$ (Apply formula: $\"open$ )

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$\"open$ (Simplify)

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$\"open$ (Apply formula: $\"open$ )

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$\"open$ (Simplify) $\"\"$

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$\"italic$ (Apply formula: $\"italic$ )

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$\"italic$ (Simplify)

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$\"italic$ (Simplify)

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$\"italic$ ( $\"italic$ ) $\"\"$

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The angle $\"italic$ .