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If the angle betweenthe lines whose direction cosines are `(-(2)/(sqrt(21)), (C )/(sqrt(21)), (1)/(sqrt(21)))` and `((3)/(sqrt(54)), (3)/(sqrt(54)), -(6)/(sqrt(54)))` is `(pi)/(2)`, then the value of C is

A

6

B

4

C

`-4`

D

2

Text Solution

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The correct Answer is:
B
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