Open Middle®
Directions: Fill in the boxes below using the digits 1 to 9, at most one time each, to make as many possible solutions as you can.
Hint
What values of trig functions give “easy to work with” solutions?
Answer
One possible answer: 4sin(x) and f'(6pi/3)
Source: Chris Luzniak
This raised an interesting question – what effect would allowing the integers from -9 to 9 have on the number of solutions? It would allow use to repeat integers providing one was negative as well as the positive and negative solution sets
Why isn’t 4sin(x) and f'(2pi/1) a solution?