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If underset(r=1)overset(n)Sigma cos^(-1)...

If `underset(r=1)overset(n)Sigma cos^(-1)x_(r)=0, then underset(r=1)overset(n)Sigma x_(r)` equals

A

n

B

2n

C

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

D

None of these

Text Solution

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The correct Answer is:
A
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