Riemann Surfaces of Inverses of Sums of Two Trigonometric Functions

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The graphic shows some sheets of the Riemann surface of for inverses of sums of trigonometric functions
and
. For purely real or imaginary parts (
or
), multiple sheets can degenerate into a single sheet.
Contributed by: Michael Trott with permission of Springer (March 2011)
From: The Mathematica Guidebook for Programming, second edition by Michael Trott (© Springer, 2008).
Open content licensed under CC BY-NC-SA
Snapshots
Details
Closed\[Hyphen]form representation of these inverse functions can be given (say by using in Mathematica), but they can be quite complicated.
For instance (in shortened form):
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