[" If "'theta'" is the acute angle betwe...

[" If "'theta'" is the acute angle between,the pair "],[" of lines "x^(2)+3xy-4y^(2)=0" then "],[cos ec theta=],[" (A) "60^(@)],[" (B) "30^(@)],[" (C) "(5)/(sqrt(34))],[" (D) "(sqrt(34))/(5)]

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