1.

IF thepairofstraightlinesxy- x -y +1=0 and thelinex +ay -3=0areconcurrentthen theacuteanglebetweenthe pairof linesax ^2- 13xy- 7y^2+ x+ 23y-6=0 is

Answer»

`cos ^(-1)((5)/(SQRT(218)))`
`cos^(-1)((1)/(sqrt(10)))`
`cos^(-1)((5)/(sqrt(173)))`
`cos^(-1)((1)/(sqrt(5)))`

ANSWER :B


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