A) 8
B) 10
C) 13
D) 25
Correct Answer: A
Solution :
[A]Let \[\lambda =\tan \theta \] |
\[\therefore x=2sin2\theta \] |
\[y=2\cos 2\theta \] |
\[\therefore {{x}^{2}}+{{y}^{2}}-xy=4-2\sin \,\,4\theta \] |
\[{{x}^{2}}+{{y}^{2}}-xy\in [2,6]\] |
\[\therefore a+b=8\] |
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