This function is defined on and is continuously differentiable on
Its derivative is
Let's solve the equation
both sides are non-negative, hence it may be squared:
which is equivalent to
or
This function is defined on and is continuously differentiable on
Its derivative is
Let's solve the equation
both sides are non-negative, hence it may be squared:
which is equivalent to
or
This gives us it must be non-negative so only "+" is suitable.
Thus which is
and
Now consider the sign of Near
it tends to
and therefore is positive, at
it is negative. Therefore
increases from
to
decreases from
to
and increases again from
to
The answer: is a local one-sided minimum,
is a local one-sided maximum,
is a local maximum and
is a local minimum.
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