\[\frac{\sin 3\theta -\cos 3\theta }{\sin \theta +\cos \theta }+1=\]

1.	\[\frac{\sin 3\theta -\cos 3\theta }{\sin \theta +\cos \theta }+1=\]
A.	\[2\sin 2\theta \]
B.	\[2\cos 2\theta \]
C.	\[\tan 2\theta \]
D.	\[\cot 2\theta \]
Answer» B. \[2\cos 2\theta \]

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\[\frac{\sin 3\theta -\cos 3\theta }{\sin \theta +\cos \theta }+1=\]

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