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If the angle betweenthe lines whose dire...

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

4, 1

B

1, 4

C

`-1,-4`

D

`-6,-3`

Text Solution

Verified by Experts

The correct Answer is:
A
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