<
restart; interface(version); # Maple 15
Digits:=40;
# symbolic expression
t:=1/292/(-77796+62196*I*3^(1/2))^(1/3)*73^(1/2)*
  ((-77796+62196*I*3^(1/2))^(1/3)*
  (-3*(-77796+62196*I*3^(1/2))^(2/3)-
  7812+688*(-77796+62196*I*3^(1/2))^(1/3)+
  3*I*3^(1/2)*(-77796+62196*I*3^(1/2))^(2/3)-7812*I*3^(1/2)))^(1/2)
  -0.3; # <--- does that give the trouble ?
simplify(t); # makes it a float ...

  0.0009678464565351217124802086279989089766498 +

                                                     -40
        0.2869143353317031656210937847013681791962 10    I

Edited: cleaned it up

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