Why "call cos(.2)" returns garbage?

[pilgrim2]

Hi, 

  I was wondering how come the call to "call cos(.2)" returns the wrong
answer in:

#include <math.h>
double    (*fcn)(double);
main() 
{
  double t;
  fcn = cos;
  t=cos(.2);
  t=cos(-.2);
}

(gdb) call cos(.2)
$16 = 104
(gdb) call fcn(.2)
$17 = 0.98006657784124163

Thanks,

Linh
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