If \( x+y=3-\cos 4 \theta \) and \( x-y=4 \sin 2 \theta \) then (A) \( x^{4}+y^{4}=9 \) (B) \( \...

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If \( x+y=3-\cos 4 \theta \) and \( x-y=4 \sin 2 \theta \) then
(A) \( x^{4}+y^{4}=9 \)
(B) \( \sqrt{\mathrm{x}}+\sqrt{\mathrm{y}}=16 \)
(C) \( x^{3}+y^{3}=2\left(x^{2}+y^{2}\right) \)
(D) \( \sqrt{x}+\sqrt{y}=2 \)
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