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    $\begingroup$ Those functions are no more "old fashioned" than logarithms and cotangents. $\endgroup$ Commented Jul 2, 2012 at 9:12
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    $\begingroup$ @Nunoxic: I don't know about the "old fashioned" bit, but I perhaps Klaus (like myself) would simply prefer seeing expressions like "$\frac{x + y}{\sin x \cos y}$" rather than "$(x+y)\csc x \sec y$". $\endgroup$ Commented Jul 2, 2012 at 9:17
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    $\begingroup$ @Siminore Your statement is not true. At least here in Germany, nowadays nobody will use Sec or Csc. $\endgroup$ Commented Jul 2, 2012 at 10:17
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    $\begingroup$ @Siminore: Csc, Sec are hardly much used in any parts of the world, at any level of school, not only in Germany. In Italy and Switzerland they are not used at all (they where mentioned once in the entire curriculum up to a M.Sc. at the Swiss Federal Institute of Technology, and they where not even taught in the USA when I was there), and hardly anyone uses them in the technics / physics. The reason being: they mostly worsen the readability of complex formula... Even though I know how to handle them, I hate them!! $\endgroup$ Commented Dec 1, 2016 at 1:48
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    $\begingroup$ I want to add my voice to those who do not like Ccs and sec. Whenever I see them I have in my mind convert them to normal sin/cos. I wish Mathematica does not use them either. $\endgroup$ Commented Apr 7, 2017 at 4:21