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IF the pair of straight lines ` xy - x -y +1=0` and the line ` x +ay -3=0` are concurrent then the acute angle between the pair of lines ` ax ^2 - 13 xy - 7y^2 + x + 23 y-6=0` is

A

`cos^-1(5/sqrt218)`

B

`cos^-1(1/sqrt10)`

C

`cos^-1(5/sqrt173)`

D

`cos^-1(1/sqrt5)`

Text Solution

Verified by Experts

The correct Answer is:
B
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