One is f(-x)=-f(x)
Second, the center is symmetrical.
In other words, it monotonically decreases within the definition on the left.
Then the right side is also monotonically decreasing.
What about this problem? X decreases monotonically at (0, 1/4).
Similarly (-1/4,0) is monotonically decreasing.
So x=- 1/4 is the largest.
X= 1/4 minimum value
F(- 1/4) can be calculated from one.