A local minimum of a function can be found by differentiating the functionOriginally Posted bynath_quam

and solving for the zeros of the derivative. These zeros comprise local

maxima, minima and points of inflection, so you will need to confirm

which of these any such zeros is.

,

so:

So we are looking for solutions of:

which with a bit of algebraic jiggery-pokery we find are:

,

and a bit more work shows that is a local minimum,

and is a local maximum.

RonL