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If Sigma( i = 1)^( 2n) sin^(-1) x(i) = ...

If ` Sigma_( i = 1)^( 2n) sin^(-1) x_(i) = n pi` , then find the value of `Sigma_( i = 1)^( 2n) x_(i)`.

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The correct Answer is:
`2n`
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