How must the
be expressed in terms of the
in order that equations (2) and (2a) may be equivalent to each other? Regarding the
expressed as functions of the
, we can write, by Taylor's theorem, for small values of the
How must the
be expressed in terms of the
in order that equations (2) and (2a) may be equivalent to each other? Regarding the
expressed as functions of the
, we can write, by Taylor's theorem, for small values of the