If the joint equation of lines making angle 'a' with the line a +y = 0and...

 

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If the joint equation of lines making angle 'a' with the line a +y = 0and passing through the origin be r? + 2hay+ y? = 0, (h > 1) then (A) sin a = 1-h V 2h (B) h+1 cos a = (C) sin a = V 2h (D) sec 2a = If the joint equation of lines making angle 'a' with the line a +y = 0and passing through the origin be r? + 2hay+ y? = 0, (h > 1) then (A) sin a = 1-h V 2h (B) h+1 cos a = (C) sin a = V 2h (D) sec 2a =