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If sum(r=1)^(n)Cos^(-1)x(r)=0," then "su...

If `sum_(r=1)^(n)Cos^(-1)x_(r)=0," then "sum_(r=1)^(n)x_(r)` equals to

A

0

B

n

C

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

D

`n/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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