Hi all,

it seems to me that Maple is not able to simplify very simple equations, e.g. the one stored in "d" variable in the following example:

> a:=sqrt(2)*cos(x)-cos(y);
                                 1/2
                           a := 2    cos(x) - cos(y)

> d:=-a/(expand(a*sqrt(2)));
                                  1/2
                                 2    cos(x) - cos(y)
                         d := - ----------------------
                                            1/2
                                2 cos(x) - 2    cos(y)

> simplify(d);
                              1/2
                             2    cos(x) - cos(y)
                            -----------------------
                                         1/2
                            -2 cos(x) + 2    cos(y)

Am I doing something wrong? How to force Maple to simplify the equation above?

Thanks in advance.