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Maths-

General

Easy

Question

If w is a complex cube root of unity then the value of $c o s invisible function application open square brackets open curly brackets left parenthesis 1 minus w right parenthesis open parentheses 1 minus w to the power of 2 end exponent close parentheses plus left parenthesis 2 minus w right parenthesis open parentheses 2 minus w to the power of 2 end exponent close parentheses close close$ $open open plus horizontal ellipsis horizontal ellipsis.. plus left parenthesis 10 minus w right parenthesis open parentheses 10 minus w to the power of 2 end exponent close parentheses close curly brackets fraction numerator pi over denominator 9 end fraction close square brackets$ is

-1
1
$\frac{1}{2}$
$\frac{- 1}{2}$

The correct answer is: 1

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