It turns out that j601 nbeta does not know how to differentiate arcsine and
arccosine. Was it always this way or the capability has been lost somewhere
along the way? I found it out when I tried to get taylor coefficients of an
expression with _2&o. as a part.
_1&o. d. 1
|domain error
| _1&o.d.1
_2&o. d. 1
|domain error
| _2&o.d.1
instead of something like 1 % 0&o. and _1 % 0&o.
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