1.

सदिश ` hati + 2 hatj + 3 hatk` की दिक् cosine ज्ञात कीजिए ।

Answer» माना ` veca = hati + 2 hatj + 3hatk `
तब ` |veca| = sqrt( 1^(2) +2^(2) + 3^(2) )= sqrt(14) `
` therefore hata =( veca )/( |veca |) implies hata =(1) /( sqrt(14)) ( hati + 2 hatj + 3 hatk)`
`implies hata =(1)/( sqrt(14)) hati +(2) /( sqrt(14)) hatj +(3) /( sqrt(14) ) hatk `
अंत : दिए गए सदिश की दिक् किज्याएँ ` (1) /( sqrt(14)), (2) /( sqrt(14))`तथा ` (3) /( sqrt(14))` है ।


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