If \( \sin \theta+\cos \theta=\sqrt{2} \cos \theta \) then \( \cos \theta-\sin \theta \) is equa...
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0If \( \sin \theta+\cos \theta=\sqrt{2} \cos \theta \) then \( \cos \theta-\sin \theta \) is equal to
(A) \( \sqrt{2} \cos \theta \)
(B) \( \sqrt{2}(\cos \theta+\sin \theta) \)
(C) \( \sqrt{2} \sin \theta \)
(D) none of these
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