If the lines represented by the equation \[a{{x}^{2}}-bxy-{{y}^{2}}=0\] make angles \[\alpha \] and \[\beta \] with the x-axis, then \[\tan (\alpha +\beta )\]=

If the lines represented by the equation \[a{{x}^{2}}-bxy-{{y}^{2}}=0\

1.	If the lines represented by the equation \[a{{x}^{2}}-bxy-{{y}^{2}}=0\] make angles \[\alpha \] and \[\beta \] with the x-axis, then \[\tan (\alpha +\beta )\]=
A.	\[\frac{b}{1+a}\].
B.	\[\frac{-b}{1+a}\]
C.	\[\frac{a}{1+b}\]
D.	None of these
Answer» C. \[\frac{a}{1+b}\]

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If the lines represented by the equation \[a{{x}^{2}}-bxy-{{y}^{2}}=0\] make angles \[\alpha \] and \[\beta \] with the x-axis, then \[\tan (\alpha +\beta )\]=

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