Relative Maximum

Press to access the maximum option which finds a value of a variable in the interval between a lower and upper bound that maximizes the expression.

Next, enter an expression, the variable, a lower bound, and an upper bound separated by commas. For example, to find the maximum value of the expression x - x3 for x between -1 and 1 enter

3 1 1

The maximum value is about 0.577.