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If sum(i=1)^(2n)cos^(-1)x(i)=0, then sum...

If `sum_(i=1)^(2n)cos^(-1)x_(i)=0`, then `sum_(i=1)^(2n)x_(i)` is :

A

n

B

2n

C

`(n(n+1))/(2) `

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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