Friday, 11 September 2015

Find any relative extrema of the function

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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