1.

यदि ` vec a = hati + 2hatj - 2hatk , vec b = 2 hati + 3hatj - hatk " तो" | vec a xx vecb |` का मान ज्ञात कीजिए |

Answer» `veca xx vecb |{:(hati , hatj , hatk ),(1 , 2,-2 ),(12 , 3, -1):}|`
` = hati ( - 2 + 6 ) - hatj (-1 + 4 ) + hatk (3 - 4)`
` 4 hati - 3 hatj - k `
` | vec a xx vecb | = sqrt( [ (4)^(2) + (-3)^(2) + (-1)^(2)]) `
` = sqrt( 16 + 9 + 1 ) = sqrt(26)`


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