Real and imaginary parts of a complex number

The re (or real) and im (or imag) commands find the real and imaginary parts of a complex number.

re takes a, a complex number (or point).
re(a) returns the real part of the complex number a (or the projection of the point a onto the x axis).
im takes a, a complex number (or point).
im(a) returns the imaginary part of the complex number a (or the projection of the point a onto the y axis).

re(3+4*i)

im(3+4*i)