Alevel doubt

[1357913579]

differentiate x under-root x? and can you explain.
in increasing funtion is fx more than x or more than and equal to x same goes for for decreasing function is it less than or less than and equal to x thanks in Advanced

 

[destined007]

Here:

when x is at the turning point then f(x) greater tha xn (for increasing) and less than x (for decreasing).