* fixed 2^63

docs/ref.tex

@@ -4993,7 +4993,7 @@ Function Cos (X : Real) : Real;
 \Description
 \var{Cos} returns the cosine of \var{X}, where X is an angle, in radians.
 
-If the absolute value of the argument is larger than \var{2^63}, then the
+If the absolute value of the argument is larger than \var{2\^{}63}, then the
 result is undefined.
 \Errors
 None.
@@ -6255,7 +6255,7 @@ Function Sin (X : Real) : Real;
 \var{Sin} returns the sine of its argument \var{X}, where \var{X} is an
 angle in radians. 
 
-If the absolute value of the argument is larger than \var{2^63}, then the
+If the absolute value of the argument is larger than \var{2\^{}63}, then the
 result is undefined.
 \Errors
 None.