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The atrig1 package contains several additional simplification rules
for inverse trigonometric functions. Together with rules
already known to Maxima, the following angles are fully implemented:
\(0\),
\(\pi/6,\)
\(\pi/4,\)
\(\pi/3,\)
and
\(\pi/2.\)
Corresponding angles in the other three quadrants are also available.
Do load("atrig1"); to use them.
The ntrig package contains a set of simplification rules that are
used to simplify trigonometric function whose arguments are of the form
f(n %pi/10) where f is any of the functions
sin, cos, tan, csc, sec and cot.