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If the angle between the lines whose dir...

If the angle between the lines whose direction cosines are
`a,(-2)/(3),(1)/(3)and(2)/(3),(1)/(3),(-2)/(3)" is "(pi)/(2)`,
then the value of a is

A

(a) `(-2)/(3)`

B

(b) `(2)/(3)`

C

(c) `(3)/(2)`

D

(d) `(-3)/(2)`

Text Solution

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The correct Answer is:
B
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