$\frac{{\sin 3\theta - \cos 3\theta }}{{\sin \theta + \cos \theta }} + 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 $
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- [IIT 1977]
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