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If (l,m,n) are direction cosines of a li...

If (l,m,n) are direction cosines of a line, then what is the value of `(l+m-n)^2+(m+n-l)^2+(l+m+n)^2+(n+l-m)^2`?

A

0

B

1

C

4

D

`4(lm+mn+nl)

Text Solution

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The correct Answer is:
C
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