[" If the acute angle between the lines ...

[" If the acute angle between the lines "],[x^(2)-4hxy+3y^(2)=0" is "60^(@)" then "h=],[[" (A) "+-(sqrt(5))/(2)," (B) "+-(sqrt(10))/(2)],[" (C) "+-(sqrt(15))/(2)," (D) "1]]

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