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Question: gfun can find sin style function?

Question:gfun can find sin style function?

lxyuzs 26 Maple 14
gfun series
March 06 2011
1

with(gfun):

> s := series(sin(x), x, 9); seriestoalgeq(s, y(x));
                  1  3    1   5    1    7    / 9\
              x - - x  + --- x  - ---- x  + O\x /
                  6      120      5040           
  [              3   /             2\                 2     ]
  [4200 x - 457 x  + \-4200 - 276 x / y(x) + 33 x y(x) , ogf]

friends,the quesions is how to find an expression like sin or cos functions .
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