The diagonals of the parallelogram whose sides are \[lx+my+n=0,\] \[lx+my+n'=0\], \[mx+1y+n=0\] and \[mx+ly+n'=0\] include an angle

\[{{\tan }^{-1}}\left( \frac{{{1}^{2}}-{{m}^{2}}}{{{1}^{2}}+{{m}^{2}}} \right)\]

\[{{\tan }^{-1}}\left( \frac{2lm}{{{1}^{2}}+{{m}^{2}}} \right)\]

The diagonals of the parallelogram whose sides are \[lx+my+n=0,\] \[lx

1.	The diagonals of the parallelogram whose sides are \[lx+my+n=0,\] \[lx+my+n'=0\], \[mx+1y+n=0\] and \[mx+ly+n'=0\] include an angle
A.	\[\frac{\pi }{3}\]
B.	\[\frac{\pi }{2}\]
C.	\[{{\tan }^{-1}}\left( \frac{{{1}^{2}}-{{m}^{2}}}{{{1}^{2}}+{{m}^{2}}} \right)\]
D.	\[{{\tan }^{-1}}\left( \frac{2lm}{{{1}^{2}}+{{m}^{2}}} \right)\]
Answer» C. \[{{\tan }^{-1}}\left( \frac{{{1}^{2}}-{{m}^{2}}}{{{1}^{2}}+{{m}^{2}}} \right)\]

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The diagonals of the parallelogram whose sides are \[lx+my+n=0,\] \[lx+my+n'=0\], \[mx+1y+n=0\] and \[mx+ly+n'=0\] include an angle

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