Q.

If α, β are the imaginary cube roots of unity then α4+β4-(α+β)-1=

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a

–1

b

1

c

2

d

0

answer is D.

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Detailed Solution

α, β are the imaginary cube roots of unity.

  α=w,  β =w2

   α4+β4 -(α+β)-1 =w4+(w2)4-1w2+w

 =w+w2-1-1=w+w2+1=0

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