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The combined equation of the lines `L_(1)` and `L_(2)` is `2x^(2)+6xy+y^(2)=0` and that lines `L_(3)` and `L_(4)` is `4x^(2)+18xy+y^(2)=0`. If the angle between `L_(1)` and `L_(4)` be `alpha`, then the angle between `L_(2)` and `L_(3)` will be

A

`(pi)/2-alpha`

B

`(pi)/4+alpha`

C

`2alpha`

D

`alpha`

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The correct Answer is:
D
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