1.

If the angle \[2\theta \]is acute, then the acute angle between \[{{x}^{2}}(\cos \theta -\sin \theta )+2xy\cos \theta +{{y}^{2}}(\cos \theta +\sin \theta )=0\] is [EAMCET 2002]

A. \[2\theta \]
B. \[\theta /3\]
C. \[\theta \]
D. \[\theta /2\]
Answer» D. \[\theta /2\]


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