Word Count : 272

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दिया गया समीकरण है: \[ (\vec{a} \times \vec{b}) \cdot (\vec{c} \times \vec{d}) + (\vec{b} \times \vec{c}) \cdot (\vec{a} \times \vec{d}) + (\vec{c} \times \vec{a}) \cdot (\vec{b} \times \vec{d}) \] ### हल: हम निम्नलिखित पहचान (identity) का उपयोग करेंगे: \[ (\vec{X} \times \vec{Y}) \cdot (\vec{P} \times \vec{Q}) = (\vec{X} \cdot \vec{P})(\vec{Y} \cdot \vec{Q}) - (\vec{X} _____ ______ _________ _________ ________ ___ ______ __________ ______.
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