1.

यदि `omega ` इकाई का काल्पनिक (अवास्तविक) घनमूल हो तो सिद्ध कीजिये कि ` ( 1 - omega ) ( 1 - omega ^ 2 ) ( 1 - omega ^ 4 ) ( 1 - omega ^ 5 ) = 9 `

Answer» ` because omega ^ 4 =omega ^ 3 .omega ` और ` omega ^ 5 = omega ^3. omega ^2 = omega ^ 2 `
LHS = ` ( 1- omega ) ( 1- omega ^ 2 ) ( 1 - omega ^ 4 ) ( 1 - omega ^ 5 ) `
` = ( 1 - omega ) ( 1 - omega ^ 2 ) ( 1 - omega ) ( 1- omega ^ 2 ) `
` = ( 1 - omega )^ 2 ( 1 - omega ^ 2 ) ^ 2 = [ ( 1 - omega ) ( 1 - omega ^ 2 ) ]^ 2 `
` =[ 1 - ( omega + omega ^ 2 ) + omega ^ 3] ^ 2 `
` = [ 1 - (- 1) + 1 ]^ 2 [ because 1 + omega + omega ^ 2 = 0 ` से ` omega + omega ^ 2 = - 1 ] `
` = ( 3)^ 2 = 9 = ` RHS


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