`eval'
------

eval(OBJ[,PREC])
     :: OBJ ͤɾ.

RETURN
     뤤ϼ
OBJ
     ̤μ
PREC
     

   * OBJ ˴ޤޤȡͤǽʸ¤ɾ.
   * ׻ PARI (*Note pari::) Ԥ.
   * PREC ꤷ, ׻, 10  PREC ٤ǹԤ. PREC 
     ꤬ʤ, ꤵƤ٤ǹԤ. (*Note
     setprec::)
   * ȡ, ̤.
          `sin', `cos', `tan',

          `asin', `acos', `atan',

          `sinh', `cosh', `tanh',

          `asinh', `acosh', `atanh',

          `exp', `log', `pow(a,b) (a^b)'
   * ʲεȤɾǤ.
     @i
          ñ
     @pi
          ߼Ψ
     @e
          п

     [118] eval(exp(@pi*@i));   
     -1.0000000000000000000000000000
     [119] eval(2^(1/2));
     1.414213562373095048763788073031
     [120] eval(sin(@pi/3));
     0.86602540378443864674620506632
     [121] eval(sin(@pi/3)-3^(1/2)/2,50);
     -2.78791084448179148471 E-58


     `ctrl', `setprec', `pari'

