Let \[x+y=3-\cos 4\theta \] and \[x-y=4sin2\theta \] then the greatest

1.	Let \[x+y=3-\cos 4\theta \] and \[x-y=4sin2\theta \] then the greatest of \[xy\]is
A.	\[\frac{3}{4}\]
B.	\[1\]
C.	\[\frac{1}{2}\]
D.	2
Answer» C. \[\frac{1}{2}\]

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Let \[x+y=3-\cos 4\theta \] and \[x-y=4sin2\theta \] then the greatest of \[xy\]is

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