- #26

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This is painful. Things to try:nothing special.

Please direct me

1) Sketch a graph of the function.

2) Analyse the derivative.

3) Analyse the points where the derivative is zero: local min, max, saddle point?

4) Look at the second derivative ##f''(x)##.

5) Use the fact that ##f## never decreases. If it did ##f'(x)## would be less than zero at some points.

6) What happens for small ##x##?

7) Have you noticed the function is symmetric about the y-axis?

You have to be prepared to do some of the thinking here.

7)