We know that $\csc \theta$ is $1/\sin \theta$ and $\tan \theta$ is $\sin \theta/\cos \theta$. So, we can rewrite the expression as follows:
$$
\csc \theta \cos \theta \tan \theta = \frac{1}{\sin \theta} \cos \theta \frac{\sin \theta}{\cos \theta}
$$
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