Given $\tan \theta \sec \theta = 1,$ find
\[\frac{1 + \sin \theta}{1 - \sin \theta} - \frac{1 - \sin \theta}{1 + \sin \theta}.\]
<|im_start|>system
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<|im_start|>user
Given $\tan \theta \sec \theta = 1,$ find
\[\frac{1 + \sin \theta}{1 - \sin \theta} - \frac{1 - \sin \theta}{1 + \sin \theta}.\]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Given $\tan \theta \sec \theta = 1,$ find
\[\frac{1 + \sin \theta}{1 - \sin \theta} - \frac{1 - \sin \theta}{1 + \sin \theta}.\]
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