cotd — cotangent
y=cotd(x)
The entries of y
are the cotangents of
the corresponding entries of x
supposed to be
given in degree. t=cos(x)./sin(x)
. For
entries equal to n*180
with
n
integers the results are infinite, whereas
cotg(n*%pi)
is large but finite because
%pi
cannot be represented exactly. For
entries equal to n*90
with
n
integers and odd the results are exactly 0.