How to find the local maximum value of a function

- Find the local maximum value of function gx x 3 3x
- Find the local maximum value of the function f x )= x 2
- Find the local maximum value of the function g x x2 3x
- Find the local maximum value of the function f x *
- Find the local maximum value of the function f x )= 3 x
- How to find maximum and minimum value of a function
- How to find maximum of function