$\"\"$

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Distributive property: $\"\"$ .

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Consider the three vectors ase $\"\"$ , $\"\"$ and $\"\"$ .

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Find the result of lefthand side of the property $\"\"$ .

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$\"\"$

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$\"\"$

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Find $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore, $\"\"$ .

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Hence property is proved.

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$\"\"$

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$\"\"$ .