If the angle between the two lines given...

If the angle between the two lines given by `ax^(2)+2hxy+by^(2)+2gx+2fy+c=0` is `(pi)/4`,
then the contsntant `a,b,h,g,f,c` are related by

A

(a) `a^(2)+6ab+4b^(2)=4h^(2)`

B

(b) `abc+2fgh-af^(2)-bg^(2)-ch^(2)=0`

C

(c) `a^(2)-ab+b^(2)=h^(2)`

D

(d) `a^(2)+6ab+b^(2)=4h^(2)`

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The correct Answer is:

D

NA

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