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यदि `veca = 2hati - 3hatj - hatk " तथा" vecb = hati + 4hatj - 2hatk ` हो , तो `(veca + vecb)xx(veca - vecb)` का मान ज्ञात कीजिए |

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यदि `veca = 2hati - 3hatj - hatk " तथा" vecb = hati + 4hatj - 2hatk ` हो , तो `(veca + vecb)xx(veca - vecb)` का मान ज्ञात कीजिए |
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`veca + vecb = 3hati + hatj - 3hatk "तथा " veca - vecb = hati - 7hatj+ hatk `
अब ` (veca + vecb )xx (veca - vecb) = =|{:(hati , hatj , hatk),(3,1,-3),(1,-7,1):}|`का मान ज्ञात कीजिए |
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