Ignore this box please.
Keyboard shortcuts
h, /     search box
j, ↓     next result
k, ↑     prev result
l, o, Enter     go

Ctrl+Enter     bg
', v     new tab
d     domain search
t     Top
!, 1     !bang dropdown
esc     out of bangs
s    Did you mean
r     related topics
m     main results
More explanation...
Binary search (can be used to search for where the derivative changes in sign)
Newton's method in optimization (can be used to search for where the derivative is zero)
Golden section search (similar to ternary search, useful if evaluating f takes most of the time per iteration)