[texhax] A PSTricks question

Ross Moore ross at ics.mq.edu.au
Sun Sep 7 12:28:50 CEST 2003

Hi all,

On Sat, 6 Sep 2003, Philip TAYLOR [PC336/H-XP] wrote:

> "Prof. Sudhir R. Ghorpade" wrote:
> >
> > Can someone tell me if there are easy ways to draw the graphs of
> > inverse trigonometric functions using PSTricks?
> >
> > It seems there are no standard commands for arcsin, arccos, arctan,
> > not to mention arcsec, arccosec, arccot.

The PostScript language has some of these:    asin,  atan
from which you can get all the others by simple trig identities,
mostly involving  pi/2 .

Alternatively, to get a graph parametrically  (x, acos x)
you could construct instead a graph of (cos y, y)
and reflect it across the line  y = x .
That should be quite easy to program in PostScript.

> I'm sure I wrote the inverse trig. functions for plain TeX
> some many years ago, but I can no longer remember the context

What do you mean by this, for Plain TeX ?
Do you mean numerical approximations, using TeX's integer arithmetic;
e.g.  a Taylor approximation ?

> in which they were needed!  However, I imagine that the code
> is still lurking somewhere on the 'net, so perhaps Google
> will be able to recall what I no longer can ...
> Philip Taylor, RHBNC
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