The equation of the pair of straight lines, each of which makes an angle \[\alpha \]with the line \[y=x\], is [MP PET 1990]

\[{{x}^{2}}+2xy\sec 2\alpha +{{y}^{2}}=0\]

\[{{x}^{2}}+2xy\,\text{cosec}\,2\alpha +{{y}^{2}}=0\]

\[{{x}^{2}}-2xy\,\text{cosec}\,2\alpha +{{y}^{2}}=0\]

\[{{x}^{2}}-2xy\sec 2\alpha +{{y}^{2}}=0\]

The equation of the pair of straight lines, each of which makes an ang

1.	The equation of the pair of straight lines, each of which makes an angle \[\alpha \]with the line \[y=x\], is [MP PET 1990]
A.	\[{{x}^{2}}+2xy\sec 2\alpha +{{y}^{2}}=0\]
B.	\[{{x}^{2}}+2xy\,\text{cosec}\,2\alpha +{{y}^{2}}=0\]
C.	\[{{x}^{2}}-2xy\,\text{cosec}\,2\alpha +{{y}^{2}}=0\]
D.	\[{{x}^{2}}-2xy\sec 2\alpha +{{y}^{2}}=0\]
Answer» E.

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The equation of the pair of straight lines, each of which makes an angle \[\alpha \]with the line \[y=x\], is [MP PET 1990]

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