The graph is decreasing and has a range of $(0, \pi)$. The domain is all real numbers.
(A) $y = \tan^{-1}x$ has a range of $(-\frac{\pi}{2}, \frac{\pi}{2})$. (B) $y = \csc^{-1}x$ has a range of $[-\frac{\pi}{2}, 0) \cup (0, \frac{\pi}{2}]$. (C) $y = \cot^{-1}x$ has a range of $(0, \pi)$. (D) $y = \sec^{-1}x$ has a range of $[0, \frac{\pi}{2}) \cup (\frac{\pi}{2}, \pi]$.
The graph matches the properties of $y = \cot^{-1}x$ as it is decreasing and has a range of $(0, \pi)$.
Final Answer: $y = \cot^{-1}x$
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