Question

$\bf \orange{how \: to \: prove \: this \: :} \\ \\ \sf \vec{a} \times ( \vec{b} \times \vec{c} \: ) = ( \vec{a}. \vec{c}) \vec{b} - ( \vec{a} .\vec{b}) \vec{c}$
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Answer 1

Step-by-step explanation:

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