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Q.

The value of k=16sin2πk7icos2πk7 is

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a

– 1 

b

c

– i

d

i

answer is A.

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Detailed Solution

iπcis2kπ7

k=1 product of roots = -1

=i

=id=i

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The value of ∏k=16sin2πk7−icos2πk7 is