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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. \[\theta /2\] | |