Questions in pair-st-lines

Select	Question
	The equation of the bisectors of the angle between the lines represented by the equation ${{x}^{2}}-{{y}^{2}}=0$, is
	If $y=mx$be one of the bisectors of the angle between the lines $a{{x}^{2}}-2hxy+b{{y}^{2}}=0$, then
	The combined equation of bisectors of angles between coordinate axes, is
	If the bisectors of the angles between the pairs of lines given by the equation $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ and $a{{x}^{2}}+2hxy+b{{y}^{2}}+\lambda ({{x}^{2}}+{{y}^{2}})=0$ be coincident, then $\lambda =$
	The combined equation of the bisectors of the angle between the lines represented by $({{x}^{2}}+{{y}^{2}})\sqrt{3}=$ $4xy$ is
	The equation of the bisectors of the angles between the lines represented by ${{x}^{2}}+2xy\cot \theta +{{y}^{2}}=0$, is
	If the bisectors of angles represented by $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ and $a'{{x}^{2}}+2h'xy+b'{{y}^{2}}=0$ are same, then
	If $r(1-{{m}^{2}})+m(p-q)=0$, then a bisector of the angle between the lines represented by the equation $p{{x}^{2}}-2rxy+q{{y}^{2}}=0$, is
	If the equation $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$has the one line as the bisector of angle between the coordinate axes, then
	If the bisectors of the angles of the lines represented by $3{{x}^{2}}-4xy+5{{y}^{2}}=0$ and $5{{x}^{2}}+4xy+3{{y}^{2}}=0$ are same, then the angle made by the lines represented by first with the second, is